Latest in cond-mat.mes-hall

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Stochastic thermodynamics of self-oscillations: the electron shuttleFeb 21 2019Self-oscillation is a phenomenon studied across many scientific disciplines, including the engineering of efficient heat engines and electric generators. We investigate the single electron shuttle, a model nano-scale system that exhibits a spontaneous ... More
Surface acoustic wave modulation of single photon emission from GaN/InGaN nanowire quantum dotsFeb 21 2019On-chip quantum information processing requires controllable quantum light sources that can be operated on-demand at high-speeds and with the possibility of in-situ control of the photon emission wavelength and its optical polarization properties. Here, ... More
Near-Field Scanning Microwave Microscopy in the Single Photon RegimeFeb 21 2019The microwave properties of nano-scale structures are important in a wide variety of applications in quantum technology. Here we describe a low-power cryogenic near-field scanning microwave microscope (NSMM) which maintains nano-scale dielectric contrast ... More
Acoustically regulated optical emission dynamics from quantum dot-like emission centers in GaN/InGaN nanowire heterostructuresFeb 21 2019We report on experimental studies of the effects induced by surface acoustic waves on the optical emission dynamics of GaN/InGaN nanowire quantum dots. We employ stroboscopic optical excitation with either time-integrated or time-resolved photoluminescence ... More
Optimized cavity-mediated dispersive two-qubit gates between spin qubitsFeb 20 2019The recent realization of a coherent interface between a single electron in a silicon quantum dot and a single photon trapped in a superconducting cavity opens the way for implementing photon-mediated two-qubit entangling gates. In order to couple a spin ... More
New insights into the electron trapping mechanism in LaAlO_3 / SrTiO3 heterostructuresFeb 20 2019In LaAlO3/SrTiO3 heterostructures, a commonly observed but poorly understood phenomenon is that of electron trapping in back-gating experiments. In this work, by combining magnetotransport measurements and self-consistent Schroedinger-Poisson calculations, ... More
Terahertz conductivity of the magnetic Weyl semimetal Mn$_{3}$Sn filmsFeb 20 2019Mn$_{3}$Sn is a non-collinear antiferromagnet which displays a large anomalous Hall effect at room temperature. It is believed that the principal contribution to its anomalous Hall conductivity comes from Berry curvature. Moreover, dc transport and photoemission ... More
Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductorFeb 20 2019Spin-orbit coupling is a fundamental mechanism that connects the spin of a charge carrier with its momentum. Likewise, in the optical domain, a synthetic spin-orbit coupling is accessible, for instance, by engineering optical anisotropies in photonic ... More
Photonic thermal conduction by infrared plasmonic resonators in semiconductor nanowiresFeb 20 2019Photons typically do not contribute to thermal transport within a solid due to their low energy density and tendency to be quickly absorbed. We propose a practical material system - infrared plasmonic resonators embedded in a semiconductor nanowire - ... More
In-Plane Magnetoconductance Mapping of InSb Quantum WellsFeb 20 2019In-plane magnetoconductance of InSb quantum wells (QW) containing a two dimensional electron gas (2DEG) is presented. Using a vector magnet, we created a magnetoconductance map which shows the suppression of weak antilocalization (WAL) as a function of ... More
Transferring the quantum state of electrons across a Fermi sea with Coulomb interactionFeb 20 2019The Coulomb interaction generally limits the quantum propagation of electrons. However, it can also provide a mechanism to transfer their quantum state over larger distances. Here, we demonstrate such a form of teleportation, across a metallic island ... More
CoFeB/MgO/CoFeB structures with orthogonal easy axes: perpendicular anisotropy and dampingFeb 20 2019We report on the Gilbert damping parameter $\alpha$, the effective magnetization $4\pi M_{eff}$, and the asymmetry of the $g$-factor in bottom-CoFeB(0.93~nm)/MgO(0.90--1.25~nm)/CoFeB(1.31~nm)-top as-deposited systems. Magnetization of CoFeB layers exhibits ... More
What retards the response of graphene based gaseous sensorFeb 20 2019Graphene based sensor to gas molecules should be ultrasensitive and ultrafast because of the single-atomic thickness of graphene, while the response is not fast. Usually, the measured response time for many molecules, such as CO, NH3, SO2, CO2 and NO2 ... More
Magnetic proximity effect in [Nb/Gd] superlattices seen by neutron scatteringFeb 20 2019We have used spin-polarized neutron reflectometry to investigate the magnetization profile of superlattices composed of ferromagnetic Gd and superconducting Nb layers. We have observed a partial suppression of ferromagnetic (F) order of Gd layers in [Gd($d_F$)/Nb(25nm)]$_{12}$ ... More
Synthetic spin orbit interaction for Majorana devicesFeb 20 2019The interplay of superconductivity with a non-trivial spin texture holds promises for the engineering of non-abelian Majorana quasi-particles. A wide class of systems expected to exhibit exotic correlations are based on nanoscale conductors with strong ... More
Quantum nanoconstrictions fabricated by cryo-etching in encapsulated grapheneFeb 20 2019More than a decade after the discovery of graphene, ballistic transport in nanostructures based on this intriguing material still represents a challenging field of research in two-dimensional electronics. The presence of rough edges in nanostructures ... More
Marginally Self-Averaging One-Dimensional Localization in Bilayer GrapheneFeb 20 2019The combination of field tunable bandgap, topological edge states, and valleys in the band structure, makes insulating bilayer graphene a unique localized system, where the scaling laws of dimensionless conductance g remain largely unexplored. Here we ... More
Valley filtering effect of phonons in graphene with a grain boundaryFeb 20 2019Due to their possibility to encode information and realize low-energy-consumption quantum devices, control and manipulation of the valley degree of freedom have been widely studied in electronic systems. In contrast, the phononic counterpart--valley phononics--has ... More
Surface-induced positive planar Hall effect in topological Kondo insulator SmB6 microribbonsFeb 20 2019Whether the surface states in SmB6 are topological is still a critical issue in the field of topological Kondo insulators. In the magneto-transport study of single crystalline SmB6 microribbons, we have revealed a positive planar Hall effect (PHE), the ... More
$h/e$ Oscillations in Interlayer Transport of DelafossitesFeb 19 2019Transport of electrons in a metal is usually well captured by their particle-like aspects, while their wavelike nature is commonly unobservable. Microstructures can be carefully designed to shield the quantum phase of the electrons from decoherence due ... More
Optical conductivity of chiral multifold fermionsFeb 19 2019Chiral multifold fermions are quasiparticles described by higher spin generalizations of the Weyl equation, and are realized as low energy excitations near symmetry protected band crossings in certain chiral crystals. In this work we calculate the linear ... More
Domain walls that do not get stuck on impuritiesFeb 19 2019We present a field theoretical model which allows for domain walls that do not get stuck on impurities. For this purpose, we consider a generalized chiral magnet domain wall action with an impurity which couples both to a potential term as well as to ... More
Non-Hermitian Boundary ModesFeb 19 2019We consider conditions for the existence of boundary modes in non-Hermitian systems with edges of arbitrary co-dimension. Through a universal formulation of the formation criteria for boundary modes in terms of local Green functions, we outline a generic ... More
Magnetic interaction and anisotropy axes arrangement in nanoparticle aggregates can enhance or reduce the effective magnetic anisotropyFeb 19 2019The magnetic response of nanostructures plays an important role on biomedical applications being strongly influenced by the magnetic anisotropy. In this work we investigate the role of temperature, particle concentration and nanoparticle arrangement forming ... More
Interferometry and coherent single-electron transport through hybrid superconductor-semiconductor Coulomb islandsFeb 19 2019Majorana zero modes are leading candidates for topological quantum computation due to their non-local character and non-abelian exchange statistics. Among their attributes, spatially separated Majorana modes are expected to allow coherent single-electron ... More
Topology and localization of a periodically driven Kitaev modelFeb 19 2019Periodically driven quantum many-body systems support anomalous topological phases of matter, which cannot be realized by static systems. In many cases, these anomalous phases can be many-body localized, which implies that they are stable and do not heat ... More
Hall micromagnetometry of individual two-dimensional ferromagnetsFeb 19 2019The recent advent of atomically-thin ferromagnetic crystals has allowed experimental studies of two-dimensional (2D) magnetism that not only exhibits novel behavior due to the reduced dimensionality but also often serves as a starting point for understanding ... More
Generation and Hall effect of skyrmions enabled via using nonmagnetic point contactsFeb 19 2019To enable functional skyrmion based spintronic devices, the controllable generation and manipulation of skyrmions is essential. While the generation of skyrmions by using a magnetic geometrical constriction has already been demonstrated, this approach ... More
Nonlinear optical response of a local surface plasmon coupled to a 2D materialFeb 19 2019We present a theoretical study of the optical response of a nonlinear oscillator formed by coupling a metal nanoparticle local surface plasmon resonance to excitonic degrees of freedom in a monolayer transition-metal dichalcogenide. We show that the combined ... More
Nanoelectromechanical resonators from high-T$_c$ superconducting crystals of Bi$_2$Sr$_2$Ca$_1$Cu$_2$O$_{8+δ}$Feb 19 2019In this report, we present nanoelectromechanical resonators fabricated with thin exfoliated crystals of a high-T$_c$ cuprate superconductor Bi$_2$Sr$_2$Ca$_1$Cu$_2$O$_{8+\delta}$. The mechanical readout is performed by capacitively coupling their motion ... More
Signatures of defect-localized charged excitons in the photoluminescence of monolayer molybdenum disulfideFeb 19 2019We study spatial photoluminescence characteristics of neutral and charged excitons across extended monolayer MoS$_2$ synthesized by chemical vapor deposition. Using two-dimensional hyperspectral photoluminescence mapping at cryogenic temperatures we identify ... More
Opto-valleytronic imaging of atomically thin semiconductorsFeb 19 2019Transition metal dichalcogenide semiconductors represent elementary components of layered heterostructures for emergent technologies beyond conventional opto-electronics. In their monolayer form they host electrons with quantized circular motion and associated ... More
Dynamics of frequency-swept nuclear spin optical pumping in powdered diamond at low magnetic fieldsFeb 18 2019A broad effort is underway to improve the sensitivity of nuclear magnetic resonance through the use of dynamic nuclear polarization. Nitrogen-vacancy (NV) centers in diamond offer an appealing platform because these paramagnetic defects can be optically ... More
Coherent control of magnon radiative damping with local photon statesFeb 18 2019The collective excitation of ordered spins, known as spin waves or magnons, can in principle radiate by emitting travelling photons to an open system when decaying to the ground state. However, in contrast to the electric dipoles, magnetic dipoles contributed ... More
Topological superconductivity at finite temperatures in proximitized magnetic nanowiresFeb 18 2019Performing Monte Carlo simulations we study the temperature dependent self--organization of magnetic moments coupled to itinerant electrons in a finite--size one--dimensional nanostructure proximitized to a superconducting reservoir. At low temperature ... More
Evidence for flat zero-energy bands incarbon-intercalated bilayer grapheneFeb 18 2019In this work, we perform ab initio calculations, based on the density functional theory, of the effects on the graphene bilayer when we intercalate carbon atoms between the layers. We use the unit cell of the bilayer to construct larger unit cells (supercells), ... More
Classification of massive Dirac models with generic non-Hermitian perturbationsFeb 18 2019We present a systematic investigation of $d$-dimensional massive Dirac models perturbed by three different types of non-Hermitian terms: (i) non-Hermitian terms that anti-commute with the Dirac Hamiltonian, (ii) non-Hermitian kinetic terms, and (iii) ... More
Anomalous thermal Hall effect in the topological antiferromagnetic stateFeb 18 2019The anomalous Hall effect (AHE), a Hall signal occurring without an external magnetic field, is one of the most significant phenomena. However, understanding the AHE mechanism has been challenging and largely restricted to ferromagnetic metals. Here, ... More
Influence of interactions on the anomalous quantum Hall effectFeb 18 2019We investigate the influence of interactions on the anomalous quantum Hall conductivity within the framework of the particular tight - binding models of the $2+1$ D topological insulator and the $3+1$ D Weyl semimetal. Several types of interactions are ... More
Universal quantized thermal conductance in grapheneFeb 18 2019The universal quantization of thermal conductance provides information on the topological order of a state beyond electrical conductance. Such measurements have become possible only recently, and have discovered, in particular, that the value of the observed ... More
Evaluation of spin diffusion length and spin Hall angle of antiferromagnetic Weyl semimetal Mn$_3$SnFeb 18 2019Antiferromagnetic Weyl semimetal Mn$_3$Sn has shown to generate strong intrinsic anomalous Hall effect (AHE) at room temperature, due to large momentum-space Berry curvature from the time-reversal symmetry breaking electronic bands of the Kagome planes. ... More
Stacking order-dependent sign-change of microwave phase due to eddy currents in nanometer-scale NiFe/Cu heterostructuresFeb 18 2019In the field of spintronics, ferromagnetic/non-magnetic metallic multilayers are core building blocks for emerging technologies. Resonance experiments using stripline transducers are commonly used to characterize and engineer these stacks for applications. ... More
Spin-polarized currents driven by spin-dependent surface screeningFeb 18 2019We have examined the spin polarization of the electron current in a ferromagnetic metal induced by the spin-dependent surface screening at the dielectric-ferromagnetic metal (D-FM) interface. In an applied ac voltage, the dynamic band splitting driven ... More
Quantum supercapacitorsFeb 18 2019Recently there has been a great deal of interest on the possibility to exploit quantum-mechanical effects to increase the performance of energy storage systems. Here we introduce and solve a model of a quantum supercapacitor. This consists of two chains, ... More
Measurements of spin polarization of FeB and FeCoB nanomagnets by the Anomalous Hall effectFeb 18 2019A new method to measure the spin polarization of a ferromagnetic nanomagnet is proposed and experimentally demonstrated. A high precision, repeatability and simplicity are the features of the proposed method. The dependency of the spin polarization on ... More
Jackiew-Rebbi zero modes in non-uniform topological insulator nanowireFeb 18 2019We theoretically investigate the emergence of Jackiew-Rebbi zero modes and their conductance signature in non-uniform topological insulator nano-wires. We modelled the non-uniform nano-wires as junction between two cylindrical nano-wires with different ... More
Magnetoelectric Response of Antiferromagnetic Van der Waals BilayersFeb 18 2019We predict that antiferromagnetic bilayers formed from van der Waals (vdW) materials, like bilayer CrI$_3$, have a strong magnetoelectric response that can be detected by measuring the gate voltage dependence of Faraday or Kerr rotation signals, total ... More
Resolving Phonon Fock States in a Multimode Cavity with a Double-Slit QubitFeb 17 2019We resolve phonon number states in the spectrum of a superconducting qubit coupled to a multimode acoustic cavity. Crucial to this resolution is the sharp frequency dependence in the qubit-phonon interaction engineered by coupling the qubit to surface ... More
Anomalous electronic shot noise in resonant tunneling junctionsFeb 17 2019We study the behavior of shot noise in resonant tunneling junctions far from equilibrium. Quantum-coherent elastic charge transport can be characterized by a transmission function, that is the probability for an incoming electron at a given energy to ... More
Redox-controlled epitaxy and magnetism of oxide heterointerfaces: EuO/SrTiO$_3$Feb 17 2019We demonstrate a novel route to prepare thin films of the ferromagnetic insulator Europium monoxide. Key is a redox-controlled interface reaction between metallic Eu and the substrate SrTiO$_3$ as the supplier of oxygen. The process allows tuning the ... More
Electrical writing, deleting, reading, and moving of magnetic skyrmioniums in a racetrack deviceFeb 17 2019A magnetic skyrmionium (also called 2$\pi$-skyrmion) can be understood as a skyrmion - a topologically non-trivial magnetic whirl - which is situated in the center of a second skyrmion with reversed magnetization. Here, we propose a new optoelectrical ... More
Electron-phonon coupling in a honeycomb borophene grown on Al(111) surfaceFeb 17 2019Recently, a honeycomb borophene was reported to grow successfully on Al(111) surface. Since the metallic $\sigma$-bonding bands of honeycomb boron sheet play a crucial role in the 39 K superconductivity of MgB$_2$, it is physically interesting to examine ... More
An optomechanical platform with a 3-dimensional waveguide cavityFeb 17 2019At low temperatures, microwave cavities are often preferred for the readout and control of a variety of systems. In this paper, we present design and measurements on an optomechanical device based on a 3-dimensional rectangular waveguide cavity. We show ... More
Hyperpolarized relaxometry based nuclear T1 noise spectroscopy in hybrid diamond quantum registersFeb 17 2019Understanding the origins of spin lifetimes in hybrid quantum systems is a matter of current importance in several areas of quantum information and sensing. Methods that spectrally map spin relaxation processes provide insight into their origin and can ... More
Implications of non-Markovian dynamics on information-driven engineFeb 16 2019The understanding of memory effects arising from the interaction between system and environment is a key for engineering quantum thermodynamic devices beyond the standard Markovian limit. We study the performance of measurement-based thermal machine whose ... More
Emission-frequency separated high quality single-photon sources enabled by phononsFeb 16 2019We demonstrate theoretically that the purity of single photons emitted from a quantum dot exciton prepared by phonon-assisted off-resonant excitation can be significantly higher in a wide range of parameters than that obtained by resonant preparation. ... More
Interlayer RKKY Coupling in Bulk Rashba Semiconductors under Topological Phase TransitionFeb 15 2019The bulk Rashba semiconductors BiTeX (X=I, Cl and Br) with intrinsically enhanced Rashba spin-orbit coupling provide a new platform for investigation of spintronic and magnetic phenomena in materials. We theoretically investigate the interlayer exchange ... More
Giant Valley Splitting in Monolayer WS2 by Magnetic Proximity EffectFeb 15 2019Lifting the valley degeneracy of monolayer transition metal dichalcogenides (TMD) would allow versatile control of the valley degree of freedom. We report a giant valley exciton splitting of 18 meV/T for monolayer WS2, using the proximity effect from ... More
Resolving spin, valley, and moiré quasi-angular momentum of interlayer excitons in WSe2/WS2 heterostructuresFeb 15 2019Moir\'e superlattices provide a powerful way to engineer properties of electrons and excitons in two-dimensional van der Waals heterostructures. The moir\'e effect can be especially strong for interlayer excitons, where electrons and holes reside in different ... More
Impurity-induced triple point fermions in twisted bilayer grapheneFeb 15 2019Triple point fermions are elusive electronic excitations that generalize Dirac and Weyl modes beyond the conventional high energy paradigm. Yet, finding real materials naturally hosting these excitations at the Fermi energy has remained challenging. Here ... More
Distinguishing Majorana Zero Modes from Impurity States through Time-Resolved TransportFeb 15 2019We study time-resolved charge transport in a superconducting nanowire using time-dependent Landauer-B\"uttiker theory. We find that the steady-state Majorana zero-bias conductance peak emerges transiently accompanied by characteristic oscillations after ... More
Magnetically controlled exciton transfer in hybrid quantum dot-quantum well nanostructuresFeb 15 2019A magnetophotoluminescence study of the carrier transfer with hybrid InAs/GaAs quantum dot(QD)-InGaAs quantum well (QW) structures is carried out where we observe an unsual dependence of the photoluminescence (PL) on the GaAs barrier thickness at strong ... More
The maximum a posteriori probability rule for atom column detection from HAADF STEM imagesFeb 15 2019Recently, the maximum a posteriori (MAP) probability rule has been proposed as an objective and quantitative method to detect atom columns and even single atoms from high-resolution high-angle annular dark-field (HAADF) scanning transmission electron ... More
Effects of decoherence on diabatic errors in Majorana braidingFeb 15 2019The braiding of two non-Abelian Majorana modes is important for realizing topological quantum computation. It can be achieved through tuning the coupling between the two Majorana modes to be exchanged and two ancillary Majorana modes. However, this coupling ... More
The atomic lensing model: new opportunities for atom-by-atom metrology of heterogeneous nanomaterialsFeb 15 2019The atomic lensing model has been proposed as a promising method facilitating atom-counting in heterogeneous nanocrystals [KHW van den Bos et. al, Phys. Rev. Lett. 116 (2016) 246101] Here, image simulations will validate the model, which describes dynamical ... More
Current-driven magnetization switching in a van der Waals ferromagnet Fe3GeTe2Feb 15 2019The recent discovery of ferromagnetism in two-dimensional (2D) van der Waals (vdW) materials holds promises for novel spintronic devices with exceptional performances. However, in order to utilize 2D vdW magnets for building spintronic nanodevices such ... More
The $8Pmmn$ borophene sheet: A solid-state platform for space-time engineeringFeb 15 2019We construct the most generic Hamiltonian of the $8Pmmn$ structure of borophene sheet in presence of spin-orbit, as well as background electric and magnetic fields. In addition to spin and valley Hall effects, this structure offers a framework to conveniently ... More
Flat band localization due to self-trapped orbitalFeb 15 2019We discover a new wave localization mechanism in a periodic system without any disorder, which can produce a novel type of perfect flat band and is distinct from the known localization mechanisms, i.e., Anderson localization and flat band lattices. The ... More
Gigahertz frequency antiferromagnetic resonance and strong magnon-magnon coupling in the layered crystal CrCl3Feb 15 2019We report broadband microwave absorption spectroscopy of the layered antiferromagnet CrCl3. We observe a rich structure of resonances arising from quasi-two-dimensional antiferromagnetic dynamics. Due to the weak interlayer magnetic coupling in this material, ... More
Measuring the Dzyaloshinskii-Moriya interaction of the epitaxial Co/Ir(111) interfaceFeb 14 2019The in-plane orientation of the magnetization in the center of domain walls is measured in Co/Ir(111) as a function of Co thickness via scanning electron microscopy with polarization analysis. Uncapped, thermally evaporated cobalt on an iridium single-crystal ... More
Local spin manipulation of quantized atomic currentsFeb 14 2019Spin is a fundamental quantum property of matter, and lifting its degeneracy lies at the heart of subtle transport phenomena and future schemes for quantum information processing. Here, we implement a microscopic spin filter for cold fermionic atoms in ... More
Anomalous Spin-Orbit Torques in Magnetic Single-Layer FilmsFeb 14 2019Spin-orbit interaction (SOI) couples charge and spin transport, enabling electrical control of magnetization. A quintessential example of SOI-induced transport is the anomalous Hall effect (AHE), first observed in 1880, in which an electric current perpendicular ... More
Breakdown of the Hebel-Slichter effect in superconducting graphene due to the emergence of Yu-Shiba-Rusinov states at magnetic resonant scatterersFeb 14 2019We study theoretically the relaxation of electron spins in graphene in proximity to an $s$-wave superconductor in the presence of resonant magnetic and spin-orbit impurities. Off resonance, the relaxation behaves as predicted from superconducting coherence: ... More
Vectorial observation of the spin Seebeck effect in epitaxial NiFe$_2$O$_4$ thin films with various magnetic anisotropy contributionsFeb 14 2019We have developed a vectorial type of measurement for the spin Seebeck effect (SSE) in epitaxial NiFe$_2$O$_4$ thin films which have been grown by pulsed laser deposition on MgGa$_2$O$_4$ (MGO) with (001) and (011) orientation as well as CoGa$_2$O$_4$ ... More
Magneto-optical effects in the Landau level manifold of 2D lattices with spin-orbit interactionFeb 14 2019Silicene is a competitive and promising 2D material, possessing interesting topological, electronic and optical properties. The presence of strong spin orbit interaction in silicene and its analogues, germanene and tinene, leads to the opening of a gap ... More
Observation of pseudospin Berry phase as a signature of nontrivial band topology in a coupled electron-hole systemFeb 14 2019Electron motion in crystals is governed by the coupling between crystal momentum and internal degrees of freedom such as spin implicit in the band structure. The description of this coupling in terms of a momentum-dependent effective field and the resultant ... More
Deterministic single ion implantation of rare-earth ions for nanometer resolution colour center generationFeb 14 2019Single dopant atoms or dopant-related defect centers in a solid state matrix provide an attractive platform for quantum simulation of topological states, for quantum computing and communication, due to their potential to realize a scalable architecture ... More
Onsager symmetry for systems with broken time-reversal symmetryFeb 14 2019We provide numerical evidence that the Onsager symmetry remains valid for systems subject to a spatially dependent magnetic field, in spite of the broken time-reversal symmetry. In addition, for the simplest case in which the field strength varies only ... More
Controlled charge and spin current rectifications in a spin polarized device: Effect of dephasingFeb 14 2019Quasicrystals have been the subject of intense research in the discipline of condensed matter physics due to their non-trivial characteristic features. We find surprisingly high degree of charge and spin current rectifications in a one-dimensional system ... More
Correlated Insulating and Superconducting States in Twisted Bilayer Graphene Below the Magic AngleFeb 13 2019The emergence of flat bands and correlated behaviors in 'magic angle' twisted bilayer graphene (tBLG) has sparked tremendous interest, though many aspects of the system are under intense debate. Here we report observation of both superconductivity and ... More
A fiber-integrated single photon source emitting at telecom wavelengthsFeb 13 2019Fiber-coupled single photon sources are essential components of photonics-based quantum information processors. Most fiber-coupled single photon sources require careful alignment between fibers and quantum emitters. In this work, we present an alignment-free ... More
Graphene thermal break-down induced by anharmonic bending modeFeb 13 2019The abrupt loss of mechanical stability of two-dimensional graphene-type crystals at a certain transition temperature is described. At this temperature, the graphene state with practically zero-speed bending sound and developed bending fluctuations becomes ... More
Numerical Analysis of the Helmholtz Green's Function for Scalar Wave Propagation Through a Nano-hole on a Plasmonic LayerFeb 13 2019A detailed numerical study of the Helmholtz Green's function for the description of scalar wave propagation through a nano-hole on a plasmonic layer is presented here. In conjunction with this, we briefly review the analytic formulation taking the nano-hole ... More
Detecting itinerant microwave photons with engineered non-linear dissipationFeb 13 2019Single photon detection is a key resource for sensing at the quantum limit and the enabling technology for measurement based quantum computing. Photon detection at optical frequencies relies on irreversible photo-assisted ionization of various natural ... More
Quantum transport through a coupled non-linear exciton-phonon systemFeb 13 2019Wavepacket transport across a nonlinear region is studied numerically at zero and finite temperatures. In contrary to the zero temperature case which demonstrates ballistic transport, finite temperature lattice vibrations suppresses the transport drastically. ... More
Full Electrostatic Control of Nanomechanical BucklingFeb 13 2019Buckling at the micro and nanoscale generates distant bistable states which can be beneficial for sensing, shape-reconfiguration and mechanical computation applications. Although different approaches have been developed to access buckling at small scales, ... More
Coherent Control of Two-Dimensional ExcitonsFeb 13 2019Electric dipole radiation can be controlled by coherent optical feedback, as has previously been studied by modulating the photonic environment for point dipoles placed both in optical cavities and near metal mirrors. In experiments involving fluorescent ... More
Non-local spin valve interferometer: Observation of superconducting spin current and Aharonov-Anandan's non-adiabatic geometric phaseFeb 13 2019An electron interferometer was designed and fabricated via a normal metal/insulator/ferromagnet non-local lateral spin valve with a ring-shaped normal metal/insulator spacer, and spin current interference was observed. A very high spin signal of 200 m$\Omega$ ... More
Quantum-dot-like states in molybdenum disulfide nanostructures due to the interplay of local surface wrinkling, strain, and dielectric confinementFeb 13 2019The observation of quantum light emission from atomically thin transition metal dichalcogenides has opened a new field of applications for these material systems. The corresponding excited charge-carrier localization has been linked to defects and strain, ... More
Comment to "Quantum Spin Hall Effect and Topological Phase Transition in HGTe Quantum Wells" by B. Andrei Bernevig, Taylor L. Hughes and Shou-Cheng Zhang Science 314, 1757 (2006)Feb 13 2019The manuscript contains Comment to "Quantum Spin Hall Effect and Topological Phase Transitio in HGTe Quantum Wells" by B. Andrei Bernevig, Taylor L. Hughes and Shou-Cheng Zhang Science 314, 1757 (2006). The text proves that the quantum state, identified ... More
Static and Dynamic Oxide-Trapped-Charge-Induced Variability in Nanoscale CMOS CircuitsFeb 13 2019The inter-device mismatch and intra-device temporal instability in the nanoscale CMOS circuits is examined from a unified point of view as a static and dynamic parts of the variability con-cerned with stochastic oxide charge trapping and de-trapping. ... More
Static and Dynamic Oxide-Trapped-Charge-Induced Variability in Nanoscale CMOS CircuitsFeb 13 2019Feb 18 2019The inter-device mismatch and intra-device temporal instability in the nanoscale CMOS circuits is examined from a unified point of view as a static and dynamic parts of the variability con-cerned with stochastic oxide charge trapping and de-trapping. ... More
Dynamics of ferromagnetic domain walls under extreme fieldFeb 13 2019We report the existence of a new regime for domain wall motion in near-uniaxial ferromagnetic nanowires, characterised by applied magnetic fields sufficiently strong that one of the domains becomes unstable. There appears a new stable solution of the ... More
Chiral magnetic chemical bonds in molecular states of impurities in Weyl semimetalsFeb 13 2019We demonstrate that chirality of the electron scattering in Weyl semimetals leads to the formation of magnetic chemical bonds for molecular states of a pair of impurities. The effect is associated with the presence of time-reversal symmetry breaking terms ... More
Phonon-induced enhancement of photon entanglement in quantum dot-cavity systemsFeb 13 2019We report on simulations of the degree of polarization entanglement of photon pairs simultaneously emitted from a quantum dot-cavity system that demand revisiting the role of phonons. Since coherence is a fundamental precondition for entanglement and ... More
Origins of overshoots in the exciton spin dynamics in semiconductorsFeb 13 2019We investigate the origin of overshoots in the exciton spin dynamics after resonant optical excitation. As a material system, we focus on diluted magnetic semiconductor quantum wells as they provide a strong spin-flip scattering for the carriers. Our ... More
Dynamics of Strongly Driven Diffusive Josephson JunctionsFeb 13 2019By measuring the Josephson emission of a diffusive Superconductor-Normal metal-Superconductor (SNS) junction at a finite temperature we reveal a non-trivial sensitivity of the supercurrent to microwave irradiation. We demonstrate that the harmonic content ... More
Elastic constants of graphene: Comparison of empirical potentials and DFT calculationsFeb 13 2019The capacity of popular classical interatomic potentials to describe elastic properties of graphene is tested. The Tersoff potential, Brenner reactive bond-order potentials REBO-1990, REBO-2000, REBO-2002 and AIREBO as well as LCBOP, PPBE-G, ReaxFF-CHO ... More
Build-up of Vibron-Mediated Electron Correlations in Molecular JunctionsFeb 13 2019We investigate on the same footing the time-dependent electronic transport properties and vibrational dynamics of a molecular junction. We show that fluctuations of both the molecular vibron displacement and the electronic current across the junction ... More
Scanning Tunneling Microscopy of an Air Sensitive Dichalcogenide Through an Encapsulating LayerFeb 13 2019Many atomically thin exfoliated 2D materials degrade when exposed to ambient conditions. They can be protected and investigated by means of transport and optical measurements if they are encapsulated between chemically inert single layers in the controlled ... More