Latest in physics.app-ph

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Experimental Demonstration of Exceptional Points of Degeneracy in Linear Time Periodic Systems and Exceptional SensitivityAug 22 2019We present the first experimental demonstration of the occurrence of exceptional points of degeneracy (EPDs) in a single resonator system by introducing a linear time-periodic variation to one of its components, in contrast to parity time (PT)-symmetric ... More
Design Study for Telecom-Wavelength Quantum Light-Sources Based on Hybrid Circular Bragg-GratingsAug 22 2019We present a design study of quantum light sources based on hybrid circular Bragg Gratings (CBGs) for emission wavelengths in the telecom O-band. The evaluated CBG designs show photon extraction efficiencies > 95% and Purcell factors close to 30. Using ... More
Tunable Birefringence in Silica Mediated Magnetic FluidAug 22 2019The present study reports magnetic and optical properties of silica mediated lauric acid stabilized magnetic fluids. The tunable birefringence ({\Delta}n) and other properties are investigated as a function of (i) concentrations of silica suspension, ... More
The role of surface depletion layer effects on the enhancement of the UV emission in ZnO induced by a nanostructured Al surface coatingAug 22 2019The UV enhancement of Al-coated ZnO single crystals with a wide range of carrier densities is systematically studied using depth-resolved cathodoluminescence (CL) and photoluminescence (PL) as well as valence band X-ray photoemission spectroscopy (VB-XPS). ... More
High-throughput fabrication and semi-automated characterization of oxide thin film transistorsAug 22 2019High throughput experimental methods are known to accelerate the rate of research, development, and deployment of electronic materials. For example, thin films with lateral gradients in composition, thickness, or other parameters have been used alongside ... More
Synthesis of strain-relaxed Ge-Sn alloys using ion implantation and pulsed laser meltingAug 22 2019Ge-Sn alloys with a sufficiently high concentration of Sn is a direct bandgap group IV material. Recently, ion implantation followed by pulsed laser melting has been shown to be a promising method to realize this material due to its high reproducibility ... More
Molecular characterization of macroscopic aerogels of single-walled carbon nanotubesAug 22 2019Single-walled carbon nanotubes (SWCNT) can be assembled into various macroscopic architectures, most notably continuous fibers and films, produced currently on a kilometer per day scale by floating catalyst chemical vapor depositionand spinning from an ... More
Size dependent yield hardness induced by surface energyAug 22 2019Size dependent hardness has long been reported in nanosized indentations, however the corresponding explanation is still in exploration. In this paper, we examine the influence of surface energy on the hardness of materials under spherical indentation. ... More
Sound Localization and Separation in Three-dimensional Space Using a Single Microphone with a Metamaterial EnclosureAug 22 2019Conventional approaches to sound localization and separation are based on microphone arrays in artificial systems. Inspired by the selective perception of human auditory system, we design a multi-source listening system which can separate simultaneous ... More
Dynamic quantum sensing of paramagnetic species using nitrogen-vacancy centers in diamondAug 21 2019Naturally occurring paramagnetic species (PS), such as free radicals and paramagnetic metalloproteins, play an essential role in a multitude of critical physiological processes including metabolism, cell signaling and immune response. These highly dynamic ... More
Prospects of designing gold-nanoparticles-based soft terahertz radiation sources and terahertz-to-infrared converters for concealed object detection technologyAug 21 2019The two-phonon scheme of generation of terahertz (THz) photons by gold nanobars (GNBs) is considered. It is shown that in GNBs, by choosing their sizes, it is possible to provide conditions for converting the energy of longitudinal phonons with THz frequencies ... More
Inverse Structural Design of Graphene/Boron Nitride Hybrids by Regressional GANAug 21 2019Inverse design of materials with desired properties is currently laborious and heavily relies on intuition of researchers through a trial-and-error process. The massive combinational spaces due to the constituent elements and their structural configurations ... More
Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructuresAug 21 2019Spin-orbit coupling stands as a powerful tool to interconvert charge and spin currents and to manipulate the magnetization of magnetic materials through the spin torque phenomena. However, despite the diversity of existing bulk materials and the recent ... More
Perfect proton selectivity in ion transport through two-dimensional crystalsAug 21 2019Defect-free monolayers of graphene and hexagonal boron nitride were previously shown to be surprisingly permeable to thermal protons, despite being completely impenetrable to all gases. It remains untested whether small ions can permeate through the two-dimensional ... More
Impact of a doping-induced space-charge region on the collection of photo-generated charge carriers in thin-film solar cells based on low-mobility semiconductorsAug 21 2019Unintentional doping of the active layer is a source for lowered device performance in organic solar cells. The effect of doping is to induce a space-charge region within the active layer, generally resulting in increased recombination losses. In this ... More
Characterising Quantum Devices at Scale with Custom Cryo-CMOSAug 21 2019We make use of a custom-designed cryo-CMOS multiplexer (MUX) to enable multiple quantum devices to be characterized in a single cool-down of a dilution refrigerator. Combined with a packaging approach that integrates cryo-CMOS chips and a hot-swappable, ... More
Depth thermography: non-invasive 3D temperature profiling using infrared thermal emissionAug 21 2019We introduce a technique based on infrared thermal emission, termed depth thermography, that can remotely measure the temperature distribution beneath the surface of certain objects. Depth thermography utilizes the thermal-emission spectrum in the semitransparent ... More
Designing Anisotropic Microstructures with Spectral Density FunctionAug 21 2019Materials' microstructure strongly influences its performance and is thus a critical aspect in design of functional materials. Previous efforts on microstructure mediated design mostly assume isotropy, which is not ideal when material performance is dependent ... More
Hot exciton transport in WSe2 monolayersAug 20 2019We experimentally demonstrate hot exciton transport in h-BN encapsulated WSe2 monolayers via spatially and temporally resolved photoluminescence measurements at room temperature. We show that the nonlinear evolution of the mean squared displacement of ... More
Persistent, rewritable frequency tuning of a nanoelectromechanical resonator using photoinduced dopingAug 20 2019Tuning the frequency of a resonant element is of vital importance in both the macroscopic world, such as when tuning a musical instrument, as well as at the nanoscale. In particular, precisely controlling the resonance frequency of isolated nanoelectromechanical ... More
Li4Ti5O12: A Visible-to-Infrared Broadband Electrochromic Material for Optical and Thermal ManagementAug 20 2019Broadband electrochromism from visible to infrared wavelengths is attractive for applications like smart windows, thermal-camouflage, and temperature control. In this work, the broadband electrochromic properties of Li4Ti5O12 (LTO) and its suitability ... More
Flexibility of Ga-containing Type-II superlattice for long-wavelength infrared detectionAug 20 2019In this paper, the flexibility of long-wavelength Type-II InAs/GaSb superlattice (Ga-containing SL) is explored and investigated from the growth to the device performance. First, several samples with different SL period composition and thickness are grown ... More
Extremely high-aspect-ratio ultrafast Bessel beam generation and stealth dicing of multi-millimeter thick glassAug 20 2019We report on the development of an ultrafast beam shaper capable of generating Bessel beams of high cone angle that maintain a high-intensity hot spot with subwavelength diameter over a propagation distance in excess of 8~mm. This generates a high-intensity ... More
A metamaterial-free fluid-flow cloakAug 20 2019The model of ideal fluid flow around a cylindrical obstacle exhibits a long-established physical picture where originally straight streamlines will be deflected over the whole space by the obstacle. As inspired by transformation optics and metamaterials, ... More
Achieving large-scale or high-resolution topology optimization based on Modified BESO and XEFMAug 20 2019To solve large-scale or high-resolution topology optimization problem, a novel algorithm is developed based on modified bi-directional evolutionary structure optimization (BESO) and extended finite element method (XFEM). Within XFEM, a set of enriched ... More
Atomic Layer Deposition Niobium Nitride Films for High-Q ResonatorsAug 20 2019Niobium nitride (NbN) is a useful material for fabricating detectors because of its high critical temperature and relatively high kinetic inductance. In particular, NbN can be used to fabricate nanowire detectors and mm-wave transmission lines. When deposited, ... More
Nanostructure engineering of epitaxial piezoelectric α-quartz thin films on siliconAug 19 2019The monolithic integration of sub-micron quartz structures on silicon substrates is a key issue for the future development of telecommunication to the GHz frequencies. Here we report unprecedented large-scale fabrication of ordered arrays of piezoelectric ... More
Highly Sensitive, Fast Graphene Photodetector with Responsivity $>10^6$ A/W Using Floating Quantum Well GateAug 19 2019Graphene, owing to its zero bandgap electronic structure, is promising as an absorption material for ultra-wideband photodetection applications. However, graphene-absorption based detectors inherently suffer from poor responsivity due to weak absorption ... More
Low temperature growth and optical properties of α-Ga2O3 deposited on sapphire by plasma enhanced atomic layer depositionAug 19 2019Plasma enhanced atomic layer deposition was used to deposit thin films of Ga2O3 on to c-plane sapphire substrates using triethylgallium and O2 plasma. The influence of substrate temperature and plasma processing parameters on the resultant crystallinity ... More
Dynamic characterization of an alkali-ion battery as a source for laser-cooled atomsAug 19 2019We investigate a solid-state, reversible, alkali-ion battery (AIB) capable of regulating the density of alkali atoms in a vacuum system used for the production of laser-cooled atoms. The cold-atom sample can be used with in-vacuum chronoamperometry as ... More
Stability of electrodynamically levitated one or many charged droplets in the presence of noiseAug 19 2019The theory of the effect of external fluctuation force on the stability and spatial distribution of mutually interacting and slowly evaporating charged drops, levitated in an electrodynamic balance, is presented using classical pseudo-potential approach. ... More
Ultrafast modulation in a THz graphene-based flat absorber through negative photoconductivityAug 19 2019We present the experimental and theoretical study of an ultrafast graphene based thin film absorption modulator for operation in the THz regime. The flat modulator is composed of a graphene sheet placed on a dielectric layer backed by a metallic back ... More
Ultrafast modulation in a THz graphene-based flat absorber through negative photoconductivityAug 19 2019Aug 20 2019We present the experimental and theoretical study of an ultrafast graphene based thin film absorption modulator for operation in the THz regime. The flat modulator is composed of a graphene sheet placed on a dielectric layer backed by a metallic back ... More
Wavefront manipulation based of the excitation of bound states in dielectric photonic crystals and bilayer metasurfacesAug 19 2019Aug 20 2019We present the study of bound surface modes sustained at the termination of truncated bulk dielectric photonic crystals and isolated metasurfaces of dielectric meta-atoms. We discuss the origins of bound modes in the two systems and their relation. For ... More
Wavefront manipulation based of the excitation of bound states in dielectric photonic crystals and bilayer metasurfacesAug 19 2019We present the study of bound surface modes sustained at the termination of truncated bulk dielectric photonic crystals and isolated metasurfaces of dielectric meta-atoms. We discuss the origins of bound modes in the two systems and their relation. For ... More
Multifunctional Composites for Elastic and Electromagnetic Wave PropagationAug 19 2019Composites are ideally suited to achieve desirable multifunctional effective properties, since the best properties of different materials can be judiciously combined with designed microstructures. Here we establish the first cross-property relations for ... More
Broadband mid-infrared perfect absorber using fractal Gosper curveAug 19 2019Aug 20 2019Designing broadband metamaterial perfect absorbers is challenging due to the intrinsically narrow bandwidth of surface plasmon resonances. Here, the paper reports an ultra-broadband metamaterial absorber by using space filling Gosper curve. The optimized ... More
Ultraviolet to Near-infrared Single Photon Emitters in hBNAug 19 2019In the field of quantum photon sources, single photon emitter from solid is of fundamental importance for quantum computing, quantum communication, and quantum metrology. However, it has been an ultimate but seemingly distant goal to find the single photon ... More
Ultraviolet to Near-infrared Single Photon Emitters in hBNAug 19 2019Aug 20 2019In the field of quantum photon sources, single photon emitter from solid is of fundamental importance for quantum computing, quantum communication, and quantum metrology. However, it has been an ultimate but seemingly distant goal to find the single photon ... More
Ultraviolet to Near-infrared Single Photon Emitters in hBNAug 19 2019Aug 21 2019In the field of quantum photon sources, single photon emitter from solid is of fundamental importance for quantum computing, quantum communication, and quantum metrology. However, it has been an ultimate but seemingly distant goal to find the single photon ... More
Experimental Study of a Planar-integrated Dual-Polarization Balanced SIS MixerAug 19 2019A dual-polarization balanced superconductor-insulator-superconductor mixer operating at 2 mm wavelength is realized in form of a monolithic planar integrated circuit. Planar orthomode transducers and LO couplers are enabled by using silicon membranes ... More
Influence of chemical stability on the fabrication of MnGa-based devicesAug 18 2019Ferromagnetic films of L10-ordered MnGa have shown promise not only in the applications in ultrahigh-density magnetic recording and spintronic memories, oscillators, and sensors, but also in controllable studies of novel electrical transport phenomena. ... More
Determination of fracture toughness of thin-film amorphous silicon using spiral crack structuresAug 18 2019We prepared thin layers of amorphous silicon by deposition of a liquid-phase polysilane precurser on glass substrate. Raman scattering provides evidence for residual tensile stress in the silicon, which is evaluated quantitatively. Under treatment with ... More
Influence of hydrogen radicals treatment on layers and solar cells made of solution-processed amorphous siliconAug 18 2019Solution-processed amorphous silicon is a promising material for semiconductor devices. Unfortunately, its manufacturing leaves a high density of defects in the layer, which can be reduced by a treatment with hydrogen radicals. Here, we present an optimized ... More
High-Speed Phase-Only Spatial Light Modulators with Two-Dimensional Tunable Microcavity ArraysAug 18 2019Spatial light modulators (SLMs) are central to numerous applications ranging from high-speed displays to adaptive optics, structured illumination microscopy, and holography. After decades of advances, SLM arrays based on liquid crystals can now reach ... More
Collimated gamma-ray beams from structured laser-irradiated targets -- how to increase the efficiency without increasing the laser intensityAug 18 2019Using three-dimensional kinetic simulations, we examine the emission of collimated gamma-ray beams from structured laser-irradiated targets with a pre-filled cylindrical channel. The channel guides the incident laser pulse, enabling generation of a slowly ... More
Electron \textit{g}-factor engineering for non-reciprocal spin photonicsAug 18 2019We study the interplay of electron and photon spin in non-reciprocal materials. Traditionally, the primary mechanism to design non-reciprocal photonic devices has been magnetic fields in conjunction with magnetic oxides, such as iron garnets. In this ... More
Confinement effect on solar thermal heating process of TiN solutionsAug 18 2019We propose a theoretical approach to describe quantitatively the heating process in aqueous solutions of dispersed TiN nanoparticles under solar illumination. The temperature gradients of solution with different concentrations of TiN nanoparticles are ... More
Screening Current-Induced Field and Field Drift Study in HTS coils using T-A homogenous modelAug 17 2019The emergence of second generation (2G) high-temperature superconductor (HTS) tapes has favored the development of HTS magnets for their applications in areas such as NMR, MRI and high field magnets. The screening current-induced field and the field drift ... More
Third method for generation of spectral holes in chiral sculptured thin filmsAug 17 2019The introduction of either a central layer defect or a central twist defect in a periodic structurally chiral material generates circular-polarization-sensitive spectral holes in the remittance spectrums for normally incident plane waves. We propose and ... More
Meta-study of laser power calibrations ranging 20 orders of magnitude with traceability to the kilogramAug 16 2019Laser power metrology at the National Institute of Standards and Technology (NIST) ranges 20 orders of magnitude from photon-counting (1000 photons/s) to 100 kW (1e23 photons/s at a wavelength of 1070 nm). As a part of routine practices, we regularly ... More
Near, far, wherever you are: simulations on the dose efficiency of holographic and ptychographic coherent imagingAug 16 2019Different studies in x-ray microscopy have arrived at conflicting conclusions about the dose efficiency of imaging modes involving the recording of intensity distributions in the near (Fresnel regime) or far (Fraunhofer regime) field downstream of a specimen. ... More
Influence of annealing temperature on the structural, topographical and optical properties of sol gel derived ZnO thin filmsAug 16 2019This investigation deals with the effect of annealing temperature on the structural, topographical and optical properties of Zinc Oxide thin films prepared by sol gel method. The structural properties were studied using X-ray diffraction and the recorded ... More
Correlative Study of Enhanced Excitonic Emission in ZnO Coated with Al Nanoparticles using Electron and Laser ExcitationAug 16 2019Metal nanoparticle (NP) surface coatings are known to significantly enhance the ultra-violet luminescence intensity of ZnO. Although there is general agreement that resonantly excited Localized Surface Plasmons (LSPs) in metal NPs can directly couple ... More
Deep sub micron normally off AlGaN/GaN MOSFET on silicon with VTH > 5V and On Current > 0.5 A/mmAug 16 2019We report on the demonstration of a deep sub-micron normally-off AlGaN/GaN HEMT with high on-current and high threshold voltage (VTH). The high-performance device was realized by utilizing a gate recess with length and depth of 200 nm and 124 nm respectively. ... More
Immobilization of water drops on hydrophobic surfaces by contact line pinning at non-lithographically generated polymer microfiber ringsAug 15 2019Water drops used as reaction compartments are commonly immobilized on hydrophilic areas bordered by hydrophobic areas. For many applications, such as the trapping of non-adherent cells, it is desirable to exploit the inertness and the anti-fouling behavior ... More
Evaluation of 3D gold nanodendrite layers obtained by templated galvanic displacement reactions for SERS sensing and heterogeneous catalysisAug 15 2019Dense layers of overlapping three-dimensional (3D) gold nanodendrites characterized by high specific surfaces as well as by abundance of sharp edges and vertices creating high densities of SERS hotspots are promising substrates for SERS-based sensing ... More
Controlling branching angle of waveguide splitters based on GRIN lensesAug 15 2019Designing beam splitting structures with wide branching angles is of great significance. The branching angle of conventional Y-junctions is limited. In this paper, we investigate the possibility of utilizing gradient index (GRIN) lenses with two focal ... More
Defect Physics of Pseudo-cubic Mixed Halide Lead Perovskites from First PrinciplesAug 15 2019Owing to the increasing popularity of lead-based hybrid perovskites for photovoltaic (PV) applications, it is crucial to understand their defect physics and its influence on their optoelectronic properties. In this work, we simulate various point defects ... More
Observation of Highly Nonlinear Resistive Switching of Al2O3/TiO2-x Memristors at Cryogenic Temperature (1.5 K)Aug 15 2019Aug 16 2019In this work, we investigate the behavior of Al2O3/TiO2-x cross-point memristors in cryogenic environment. We report successful resistive switching of memristor devices from 300 K down to 1.5 K. A temperature-induced shift of the the RESET voltage is ... More
Observation of Highly Nonlinear Resistive Switching of Al2O3/TiO2-x Memristors at Cryogenic Temperature (1.5 K)Aug 15 2019In this work, we investigate the behavior of Al2O3/TiO2-x cross-point memristors in cryogenic environment. We report successful resistive switching of memristor devices from 300 K down to 1.5 K. A temperature-induced shift of the the RESET voltage is ... More
Magnetic proximity in a van der Waals heterostructure of magnetic insulator and grapheneAug 15 2019Engineering two-dimensional material heterostructures by combining the best of different materials in one ultimate unit can offer a plethora of opportunities in condensed matter physics. Here, in the van der Waals heterostructures of the ferromagnetic ... More
Enhancing the speed and sensitivity of a nonlinear optical sensor with noiseAug 15 2019We demonstrate how noise can be turned into an advantage for optical sensing using a nonlinear cavity. The cavity is driven by a continuous wave laser into the regime of optical bistability. Due to the influence of fluctuations, the cavity randomly switches ... More
Time-Resolved Open-Circuit Conductive Atomic Force Microscopy for Quantitative Analysis of Piezoelectricity and Triboelectricity in NanowiresAug 15 2019Piezoelectric nanowires are promising materials for sensing, actuation and energy harvesting, due to their enhanced properties at the nanoscale. However, quantitative characterization of piezoelectricity in nanomaterials is challenging due to practical ... More
Macroscopic electron-hole distribution in silicon and cubic silicon carbideAug 15 2019Electron excitations at silicon and 3C-SiC surfaces caused by an intense femtosecond laser pulse can be calculated by solving the time-dependent density functional theory and the Maxwell's equation simultaneously. The energy absorption, carrier density, ... More
Three-dimensional Near-field Anatomy Reveals Geometric Resonance of Hyperbolic Phonon Polariton Micro-StructuresAug 14 2019Standing waves of defined momentum arise when the propagating wave is confined by finite boundaries of suitable dimensions and symmetry. Phonon polaritons, often supported by two-dimensional materials, are waves formed from hybridization of collective ... More
Shaping of sessile magnetic drops due to electromagnetic stressAug 14 2019While electric fields have been widely studied for drop shaping and digital microfluidics, a unified electromagnetic approach inclusive of magnetic fields is by far less known. Here using the electromagnetic stress tensor, we derive the stress acting ... More
Phonon and Thermal Properties of Quasi-Two-Dimensional FePS3 and MnPS3 Antiferromagnetic Semiconductor MaterialsAug 14 2019We report results of investigation of the phonon and thermal properties of the exfoliated films of layered single crystals of antiferromagnetic FePS3 and MnPS3 semiconductors. The Raman spectroscopy was conducted using three different excitation lasers ... More
Exploring the behavior of vanadium under high-pressure and high-temperature conditionsAug 14 2019We report a combined experimental and theoretical study of the melting curve and the structural behavior of vanadium under extreme pressure and temperature. We performed powder x-ray diffraction experiments up to 120 GPa and 4000 K, determining the phase ... More
Understanding the image contrast of material boundaries in IR nanoscopy reaching 5 nm spatial resolutionAug 14 2019Scattering-type scanning near-field optical microscopy (s-SNOM) allows for nanoscale resolved Infrared (IR) and Terahertz (THz) imaging, and thus has manifold applications ranging from materials to biosciences. However, a quantitatively accurate understanding ... More
Towards Topological Protection based millimetre wave devicesAug 14 2019Feasibility of Topological Metawaveguides supporting helical propagation in the microwave range has been recently proven. The advantages of unidirectional propagation supported by such waveguides however can only be exploited in real devices if topological ... More
Chemically-controlled self-assembly of hybrid plasmonic nanopores on grapheneAug 14 2019Thanks to the spontaneous interaction between noble metals and biological scaffolds, nanomaterials with unique features can be achieved following relatively straightforward and cost-efficient synthetic procedures. Here, plasmonic silver nanorings are ... More
Addressing band-edge-property spatial variations and localized-state carrier trapping and recombination in solar cell numerical modelingAug 14 2019Conduction and valence band-edge-property variations with position as well as defects giving rise to localized states in the energy gap can play a significant role in determining solar cell performance. Understanding their effects on a device is necessary ... More
Focusing Surface Acoustic Wave Microcavities on GaAsAug 14 2019Focusing microcavities for surface acoustic waves (SAWs) produce highly localized strain and piezoelectric fields that can dynamically control excitations in nanostructures. Focusing transducers (FIDTs) that generate SAW beams which match nanostructure ... More
Magnetic Skyrmion Field-Effect TransistorsAug 14 2019Magnetic skyrmions are of considerable interest for low-power memory and logic devices because of high speed at low current and high stability due to topological protection. We propose a skyrmion field-effect transistor based on a gate-controlled Dzyaloshinskii-Moriya ... More
Photochemical Upconversion Theory: Importance of Triplet Energy Levels and Triplet QuenchingAug 14 2019Photochemical upconversion is a promising way to boost the efficiency of solar cells using triplet exciton annihilation. Currently, predicting the performance of photochemical upconversion devices is challenging. We present an open source software package ... More
Three-Oscillator Vibrational Band-Gap Renormalization and Band-Tailing in CsPbI$_3$ Perovskite NanocrystalsAug 13 2019The band-gaps of CsPbI$_3$ and CsPbBr$_3$ perovskite nanocrystals are measured by absorption spectroscopy at cryogenic temperatures. Anomalous band-gap shifts are observed in both types of nanocrystals, which are modeled accurately by band-gap renormalization ... More
TCAD model for TeraFET detectors operating in a large dynamic rangeAug 13 2019We present technology computer-aided design (TCAD) models for AlGaAs/InGaAs and AlGaN/GaN and silicon TeraFETs, plasmonic field effect transistors (FETs), for terahertz (THz) detection validated over a wide dynamic range. The modeling results are in good ... More
Self-Assembled Room Temperature Multiferroic BiFeO3-LiFe5O8 NanocompositesAug 13 2019Multiferroic materials have driven significant research interest due to their promising technological potential. Developing new room-temperature multiferroics and understanding their fundamental properties are important to reveal unanticipated physical ... More
Towards infrared toroidal photodevices: A ReviewAug 13 2019Plasmon excitations in metallic nanostructures can decay directly into dynamic electron-hole pairs (EHPs), exploitable for photocurrent generation. This approach has extensively been employed to develop nanoplasmonic light-sensing devices with significant ... More
Competing Phases in Epitaxial Vanadium Dioxide at NanoscaleAug 13 2019Phase competition in correlated oxides offers tantalizing opportunities as many intriguing physical phenomena occur near the phase transitions. Owing to a sharp metal-insulator transition (MIT) near room temperature, correlated vanadium dioxide (VO2) ... More
On-chip directional octave-spanning supercontinuum generation from high order mode in near ultraviolet to infrared spectrum using AlN waveguidesAug 13 2019On-chip ultraviolet to infrared (UV-IR) spectrum frequency metrology is of crucial importance as a characterization tool for fundamental studies on quantum physics, chemistry, and biology. Due to the strong material dispersion, traditional techniques ... More
Splat formation and microstructure of solution precursor thermal sprayed Nb-doped titanium oxide coatingsAug 13 2019Solution precursor thermal spray can become a breakthrough technology for the deposition of coatings with novel chemistries; however, the understanding of the process that the feedstock material undergoes is still poorly understood when compared to more ... More
Thermodynamic Origin of Structural Superlubricity: Entropy MattersAug 13 2019Structural superlubricity, a state of vanishing friction between two incommensurate contact surfaces, is a fascinating phenomenon in modern tribology and shows attractive applications in the fields of sliding devices. Here, we reveal that structural superlubricity ... More
Magnetization current simulation of high temperature bulk superconductors using A-V-A formula based iterative algorithm methodAug 13 2019In this work we will introduce the A-V-A formula based iterative algorithm method (IAM) for simulating the magnetization of superconductors. This new method is for the first time tested in simulating both the critical state model and the flux creep model ... More
Potential and limits of superlattice multipliers coupled to different input power sourcesAug 13 2019A theoretical study is presented to assess the performance of semiconductor superlattice multipliers as a function of the currently available input power sources. The prime devices which are considered as input power sources are Impatt diodes, InP Gunn ... More
Nanoparticles manipulation in 3D nanotips excited with plasmonic vortexAug 13 2019Aug 15 2019Recent advances in nanotechnologies have prompted the need for tools to accurately and non invasively manipulate individual nanoobjects. Among the possible strategies, optical forces have been widely used to enable nano optical tweezers capable of trapping ... More
Nanoparticles manipulation in 3D nanotips excited with plasmonic vortexAug 13 2019Recent advances in nanotechnologies have prompted the need for tools to accurately and non invasively manipulate individual nanoobjects. Among the possible strategies, optical forces have been widely used to enable nano optical tweezers capable of trapping ... More
Response to 'Room Temperature, Quantum-Limited THz Heterodyne Detection? Not Yet'Aug 13 2019This commentary is written in response to arXiv:1907.13198. In this article, Zmuidzinas et al. raise questions about the results reported by our group in Nature Astronomy (DOI: 10.1038/s41550-019-0828-6) regarding our experimental methodology and our ... More
Site selective synthesis of in situ Ni filled multiwalled carbon nanotubes using Ni(salen) as a catalyst sourceAug 13 2019The synthesis of Ni filled multiwalled carbon nanotubes was performed by atmospheric pressure chemical vapor deposition with propane on Si at 850 C using a simple mixture of Ni(salen), and a conventional photoresist. Analysis of the carbon nanotubes using ... More
On-chip label-free biosensing based on active whispering gallery mode resonators pumped by a light-emitting diodeAug 13 2019Biosensing based on whispering-gallery mode (WGM) resonators has been continuously studied with great attention due to its excellent sensitivity guaranteeing the label-free detection. However, its practical impact is insignificant to date despite notable ... More
Investigating the real-time dissolution of a compositionally complex alloy using inline ICP and correlation with XPSAug 13 2019The real-time dissolution of the single-phase compositionally complex alloy (CCA), Al1.5TiVCr, was studied using an inline inductively coupled plasma method. Compositionally complex alloys (CCAs), a term encompassing high entropy alloys (HEAs) or multi-principal ... More
Dopant-free molecular hole transport material that mediates a 20% power conversion efficiency in a perovskite solar cellAug 12 2019Organic molecular hole-transport materials (HTMs) are appealing for the scalable manufacture of perovskite solar cells (PSCs) because they are easier to reproducibly prepare in high purity than polymeric and inorganic HTMs. There is also a need to construct ... More
Rollable Magnetoelectric Energy Harvester as Wireless IoT SensorAug 12 2019Perhaps the most abundant form of waste energy in our surrounding is the parasitic magnetic noise arising from electrical power transmission system. In this work, a flexible and rollable magneto-mechano-electric nanogenerator (MMENG) based wireless IoT ... More
Magnetic resonance force microscopy with a one-dimensional resolution of 0.9 nanometersAug 12 2019Magnetic resonance force microscopy (MRFM) is a scanning probe technique capable of detecting MRI signals from nanoscale sample volumes, providing a paradigm-changing potential for structural biology and medical research. Thus far, however, experiments ... More
Superconductor-ferromagnet tunnel junction thermoelectric bolometer and calorimeter with a SQUID readoutAug 12 2019Superconductor-ferromagnet thermoelectric detector (SFTED) is a novel ultrasensitive radiation detector based on the giant thermoelectric effect in superconductor-ferromagnet tunnel junctions. This type of detector can be operated without the need of ... More
The role of graphitic filaments in resistive switching behaviour of amorphous silicon carbide thin filmsAug 12 2019Resistive switching in amorphous silicon carbide (a-SiC) films deposited by a single composite target magnetron sputtering process is reported. Switching performance as a function of thickness of the films (50, 100 and 300 nm) as well as different top ... More
Graphene-based spinmechatronic valveAug 12 2019Interlayer twist between van der Waals graphene crystals led to the discovery of superconducting and insulating states near the magic angle. In this work, we exploit this mechanical degree of freedom by twisting the graphene middle layer in a trilayer ... More
Role of electrostatic potential energy in carbon nanotube augmented cement paste matrixAug 11 2019The empirical data in conjunction with the quantum mechanical calculations show that the strength enhancement in the cement-carbon nanotubes (CNTs) composites is the courtesy of electrostatic potential energy. This is contrary to the general belief that ... More
Al-Cu-Fe alloys: the relationship between the quasicrystal and its meltAug 11 2019Understanding the mechanisms which relate properties of liquid and solid phases is crucial for fabricating new advanced solid materials, such as glasses, quasicrystals and high-entropy alloys. Here we address this issue for quasicrystal-forming Al-Cu-Fe ... More