Latest in cond-mat.mes-hall

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Topological PhotonicsFeb 12 2018Topological photonics is a rapidly-emerging field of research in which geometrical and topological ideas are exploited to design and control the behavior of light. Drawing inspiration from the discovery of the quantum Hall effects and topological insulators ... More
Room-Temperature Quantum-Confined Stark Effect in Atomically Thin SemiconductorFeb 08 2018Electric field-controlled, two-dimensional (2D) exciton dynamics in transition metal dichalcogenide monolayers is a current research focus in condensed matter physics. We have experimentally investigated the spectral and temporal properties of the A-exciton ... More
Emergence of Topologically Protected Helical States in Minimally Twisted Bilayer GrapheneFeb 08 2018Bilayer graphene samples in which inversion symmetry is broken have quantum valley Hall ground states that support counterpropogating topologically protected helical (TPH) edge states localized along domain walls between AB and BA stacking regions. Moreover, ... More
Negative longitudinal magnetoresistance in the density wave phase of Y$_2$Ir$_2$O$_7$Feb 08 2018The ground state of nanowires of single crystalline Pyrochlore Y$_2$Ir$_2$O$_7$ is a density wave. Application of a {\it transverse} magnetic field increases the threshold electric field for the collective de-pinning of the density wave state at low temperature, ... More
A simple descriptor for energetics at fcc-bcc metal interfacesFeb 08 2018We develop a new and user-friendly method for calculating interface energies from first-principles. Our approach avoids problems that derive from the numerical differences between bulk and slab calculations, such as the number of k-points along the direction ... More
Coherent control of solid state nuclear spin nano-ensemblesFeb 08 2018Detecting and controlling nuclear spin nano-ensembles is crucial for the further development of nuclear magnetic resonance (NMR) spectroscopy and for the emerging solid state quantum technology. Here we present the fabrication of a $\approx$ 1 nanometre ... More
Time-dependent transport of a localized surface plasmon through a linear array of metal nanoparticles: Precursor and normal mode contributionsFeb 08 2018We theoretically investigate the time-dependent transport of a localized surface plasmon excitation through a linear array of identical and equidistantly spaced metal nanoparticles. Two different signals propagating through the array are found: one traveling ... More
Self-ordered nanostructures on patterned substrates: Experiment and theory of metalorganic vapor-phase epitaxy of V-groove quantum wires and pyramidal quantum dotsFeb 08 2018The formation of nanostructures during metalorganic vapor-phase epitaxy on patterned (001)/(111)B GaAs substrates is reviewed. The focus of this review is on the seminal experiments that revealed the key kinetic processes during nanostructure formation ... More
Stability of Kramers Majorana doublets: the effects of interactions and disordersFeb 08 2018In this work we study the effects of interactions and disorder on $1D$ DIII topological superconductors and the Majorana Kramers doublets (MKDs). In contract to the case without the time-reversal symmetry, the Umklapp interaction plays important roles ... More
Higher-Order Topology in BismuthFeb 07 2018The mathematical field of topology has become a framework to describe the low-energy electronic structure of crystalline solids. A typical feature of a bulk insulating three-dimensional topological crystal are conducting two-dimensional surface states. ... More
Mechanical Stresses Estimation in Silicon and Glass Bonded at Elevated TemperatureFeb 07 2018During electrostatic bonding, also known as anodic bonding, silicon is bonded to glass by applying an external voltage and simultaneous heating to temperatures of 200...450 $\deg$C. While cooling to working temperature after bonding happened pieces are ... More
Low-Frequency Noise and Sliding of the Charge Density Waves in Two-Dimensional MaterialsFeb 07 2018There has been a recent renewal of interest in charge-density-wave (CDW) phenomena, primarily driven by the emergence of two-dimensional (2D) layered CDW materials, such as 1T-TaS2, characterized by very high transition temperatures to CDW phases. In ... More
Polariton Hall Effect in Transition-Metal DichalcogenidesFeb 07 2018We analyze the properties of strongly coupled excitons and photons in systems made of semiconducting two-dimensional transition-metal dichalcogenides embedded in optical cavities. Through a detailed microscopic analysis of the coupling we unveil novel, ... More
Asymmetric Electric Field Screening in van der Waals HeterostructuresFeb 07 2018Electric field screening plays an important role in the physical and chemical properties of materials and their devices. Here, we use a compelling set of theoretical and experimental techniques involving van der Waals (vdW) ab initio density functional ... More
Dark states in spin-polarized transport through triple quantum dot moleculesFeb 07 2018We study the spin-polarized transport through a triple quantum dot molecule weakly coupled to ferromagnetic leads. The analysis is performed by means of the real-time diagrammatic technique including up to the second order of perturbation expansion with ... More
Breaking the current density threshold in spin-orbit-torque magnetic random access memoryFeb 07 2018Spin-orbit-torque magnetic random access memory (SOT-MRAM) is a promising technology for the next generation of data storage devices. The main bottleneck of this technology is the high reversal current density threshold. This outstanding problem of SOT-MRAM ... More
Role of atomic spin-mechanical coupling in the problem of magnetic biocompassFeb 07 2018It is a well established notion that animals can detect the Earth's magnetic field, while the biophysical origin of such magnetoreception is still elusive. Recently, a magnetic receptor Drosophila CG8198 (MagR) with a rod-like protein complex is reported ... More
From one-dimensional charge conserving superconductors to the gapless Haldane phaseFeb 07 2018We develop a framework to analyze one-dimensional topological superconductors with charge conservation. In particular, we consider models with $N$ flavors of fermions and $(\mathbb{Z}_2)^N$ symmetry, associated with the conservation of the fermionic parity ... More
Universal Approach to Quantum Adiabaticity via Ancilla CavityFeb 07 2018A central challenge in the successful implementation of adiabatic quantum algorithms is to maintain the quantum adiabaticity during the entire evolution. However, the energy gap between the ground and the excited states of interacting many-body systems ... More
Reconfigurable topological phases in next-nearest-neighbor coupled resonator latticesFeb 06 2018We present a reconfigurable topological photonic system consisting of a 2D lattice of coupled ring resonators, with two sublattices of site rings coupled by link rings, which can be accurately described by a tight-binding model. Unlike previous coupled-ring ... More
Topological phase transition measured in a dissipative metamaterialFeb 06 2018We construct a metamaterial from radio-frequency harmonic oscillators, and find two topologically distinct phases resulting from dissipation engineered into the system. These phases are distinguished by a quantized value of bulk energy transport. The ... More
Magnetic oscillations Excited by Concurrent Spin Injection from a Tunneling Current and a Spin Hall CurrentFeb 06 2018In this paper, a 3-terminal spin-transfer torque nano-oscillator (STNO) is studied using the concurrent spin injection of a spin-polarized tunneling current and a spin Hall current exciting the free layer into dynamic regimes beyond what is achieved by ... More
Via Method for Lithography Free Contact and Preservation of 2D MaterialsFeb 06 2018Atomically thin 2D materials span the common components of electronic circuits as metals, semi-conductors, and insulators, and can manifest correlated phases such as superconductivity, charge density waves, and magnetism. An ongoing challenge in the field ... More
Dynamical synchronization transition in interacting electron systemsFeb 06 2018Using graphene irradiated by an intense bi-circular pulse laser as a prototypical example, we theoretically investigate how to selectively generate coherent oscillation of electronic orders such as charge density waves (CDW), where the key is to use tailored ... More
Building Symmetry Enriched Topological Phases from a Bipartite Lattice Construction and Anyon CondensationFeb 06 2018We introduce a construction of symmetry-enriched topological orders on bipartite lattices in which two $\mathbb{Z}_2$ spin liquids defined on each sublattice are combined, and then anyons are condensed to reduce the topological order. By choosing different ... More
Interacting birefringent electrons: Marginal- or non-Fermi liquid of spin-1/2 fermionsFeb 06 2018We present the quantum critical theory of an interacting nodal Fermi-liquid of quasi-relativisitc (pseudo)-spin-3/2 fermions that have a non-interacting \emph{birefringent} spectrum with \emph{two} distinct Fermi velocities. When such quasiparticles interact ... More
Tunable current circulation in triangular quantum-dot metastructuresFeb 06 2018Advances in fabrication and control of quantum dots allow the realization of metastructures that may exhibit novel electrical transport phenomena. Here, we investigate the electrical current passing through one such metastructure, a system composed of ... More
All-electrical universal control of a double quantum dot qubit in silicon MOSFeb 06 2018Qubits based on transistor-like Si MOS nanodevices are promising for quantum computing. In this work, we demonstrate a double quantum dot spin qubit that is all-electrically controlled without the need for any external components, like micromagnets, that ... More
Nonlinear heat transport in ferromagnetic-quantum dot-superconducting systemsFeb 06 2018We analyze the heat current traversing a quantum dot sandwiched between a ferromagnetic and a superconducting electrode. The heat flow generated in response to a voltage bias presents rectification as a function of the gate potential applied to the quantum ... More
Domain walls and Dzyaloshinskii-Moriya interaction in epitaxial Co/Ir(111) and Pt/Co/Ir(111)Feb 06 2018We use spin-polarized scanning tunneling microscopy and density functional theory (DFT) to study domain walls (DWs) and the Dzyaloshinskii-Moriya interaction (DMI) in epitaxial films of Co/Ir(111) and Pt/Co/Ir(111). Our measurements reveal DWs with fixed ... More
Engineering topological phases in Luttinger semimetal $α$-SnFeb 06 2018$\alpha$-Sn is well-known as a typical Luttinger semimetal with a quadratic band touching at the $\Gamma$ point. Based on the effective $k\cdot p$ analysis as well as first-principles calculations, we demonstrate that multiple topological phases with ... More
Graphene-Based Broadband High-Frequency Ultrasound DetectorFeb 06 2018Ultrasound detection is one of the most important nondestructive subsurface characterization tools of materials, whose goal is to laterally resolve the subsurface structure with nanometer or even atomic resolution. In recent years, graphene resonators ... More
Riesz projection based theory of light-matter interaction in dispersive nanoresonatorsFeb 06 2018A theory based on Riesz projections is introduced to analyze the coupling of light sources to resonant states of nanostructures. The concept applies to general dispersive media without the explicit use of a mode orthogonality relation and allows for the ... More
Analog quantum simulation of generalized Dicke models in trapped ionsFeb 06 2018We propose the analog quantum simulation of generalized Dicke models in trapped ions. By combining bicromatic laser interactions on multiple ions we can generate all regimes of light-matter coupling in these models, where here the light mode is mimicked ... More
Wannier-function-based constrained DFT with nonorthogonality-correcting Pulay forces in application to the reorganization effects in graphene-adsorbed pentaceneFeb 05 2018Pulay terms arise in the Hellman-Feynman forces in electronic structure calculations when one employs a basis set made of localized orbitals that move with their host atoms. If the total energy of the system depends on a subspace population, defined in ... More
Quantum many-body dynamics of the Einstein-de Haas effectFeb 05 2018In 1915, Einstein and de Haas and Barnett demonstrated that changing the magnetization of a magnetic material results in mechanical rotation, and vice versa. At the microscopic level, this effect governs the transfer between electron spin and orbital ... More
Losses in plasmonics: from mitigating energy dissipation to embracing loss-enabled functionalitiesFeb 05 2018Unlike conventional optics, plasmonics enables unrivalled concentration of optical energy well beyond the diffraction limit of light. However, a significant part of this energy is dissipated as heat. Plasmonic losses present a major hurdle in the development ... More
Interaction of phonons with discrete breather in strained grapheneFeb 05 2018We numerically analyze the interaction of small-amplitude phonon waves with standing gap discrete breather (DB) in strained graphene. To make the system support gap DB, strain is applied to create a gap in the phonon spectrum. We only focus on the in-plane ... More
Semimetal behavior of bilayer staneneFeb 05 2018Stanene is a two-dimensional (2D) buckled honeycomb structure which has been studied recently owing to its promising electronic properties for potential electronic and spintronic applications in nanodevices. In this article, we present a first-principles ... More
Voltage-Controlled Superconducting Quantum BusFeb 05 2018We demonstrate the ability of an epitaxial semiconductor-superconductor nanowire to serve as a field-effect switch to tune a superconducting cavity. Two superconducting gatemon qubits are coupled to the cavity, which acts as a quantum bus. Using a gate ... More
Realization of a spin wave switch based on the Spin-Transfer-Torque effectFeb 05 2018We investigate the amplification of externally excited spin waves via the Spin-Transfer-Torque (STT) effect in combination with the Spin-Hall-Effect (SHE) employing short current pulses. The results reveal that, in the case of an overcompensation of the ... More
NV-Metamaterial: Tunable Quantum Hyperbolic Metamaterial Using Nitrogen-Vacancy Centers in DiamondFeb 05 2018Feb 06 2018We show that nitrogen-vacancy (NV) centers in diamond can produce a novel quantum hyperbolic metamaterial. We demonstrate that a hyperbolic dispersion relation in diamond with NV centers can be engineered and dynamically tuned by applying a magnetic field. ... More
Different regimes of Purcell Effect in Disordered Photonic CrystalsFeb 04 2018We demonstrate that disorder in photonic crystals could lead to pronounced modification of spontaneous emission rate in the frequency region corresponding to the photonic band gap (PBG). Depending on the amount of disorder, two different regimes of the ... More
Optical modulation of coherent phonon emission in optomechanical cavitiesFeb 04 2018Optomechanical structures are well suited to study photon-phonon interactions, and they also turn out to be potential building blocks for phononic circuits and quantum computing. In phononic circuits, in which information is carried and processed by phonons, ... More
Hybrid 2D Black Phosphorus/Polymer Materials: New Platforms for Device FabricationFeb 04 2018Hybrid materials, containing a 2D filler embedded in a polymeric matrix, are an interesting platform for several applications, because of the variety of properties that the filler can impart to the polymer matrix when dispersed at the nanoscale. Moreover, ... More
Lieb polariton topological insulatorsFeb 04 2018We predict that the interplay between the spin-orbit coupling, stemming from the TE-TM energy splitting, and the Zeeman effect in semiconductor microcavities supporting exci- ton-polariton quasi-particles results in the appearance of unidirectional linear ... More
Topological interface states mediated by spontaneous symmetry breakingFeb 04 2018We propose a one-dimensional nonlinear system of coupled anharmonic oscillators that dynamically undergoes a topological transition switching from the {disordered} and topologically trivial phase into the nontrivial one due to the spontaneous symmetry ... More
Magnon scattering in the transport coefficients of CoFe alloysFeb 03 2018Resistivity $\rho$, thermopower ${\cal S}$, and thermal conductivity $\kappa$ were measured simultaneously on a set of CoFe alloy films. Variation of the Co-content $x_\mathrm{Co}$ allows for a systematic tuning of the Fermi level through the band structure, ... More
Hybrid Nodal Loop Metal: Unconventional Magnetoresponse and Material RealizationFeb 03 2018A nodal loop is formed by band crossing along a one-dimensional closed manifold, with each point on the loop a linear nodal point in the transverse dimensions and can be classified as type-I or type-II depending on the band dispersion. Here, we propose ... More
Spin wave emission by spin-orbit torque antennasFeb 02 2018Feb 08 2018We study the generation of propagating spin waves in Ta/CoFeB waveguides by spin-orbit torque antennas and compare them to conventional inductive antennas. The spin-orbit torque was generated by a transverse microwave current across the magnetic waveguide. ... More
Spin wave emission by spin-orbit torque antennasFeb 02 2018We study the generation of propagating spin waves in Ta/CoFeB waveguides by spin-orbit torque antennas and compare them to conventional inductive antennas. The spin-orbit torque was generated by a transverse microwave current across the magnetic waveguide. ... More
Non-universality of the adiabatic chiral magnetic effect in a clean Weyl semimetal slabFeb 02 2018The adiabatic chiral magnetic effect (CME) is a phenomenon by which a slowly oscillating magnetic field applied to a conducting medium induces an electric current in the instantaneous direction of the field. Here we theoretically investigate the effect ... More
Gate tunable WSe2/SnSe2 backward diode with ultrahigh reverse rectification ratioFeb 02 2018Backward diodes conduct more efficiently in the reverse bias than in the forward bias, providing superior high frequency response, temperature stability, radiation hardness, and 1/f noise performance than a conventional diode conducting in the forward ... More
Quantum holography in a graphene flake with an irregular boundaryFeb 02 2018Electrons in clean macroscopic samples of graphene exhibit an astonishing variety of quantum phases when strong perpendicular magnetic field is applied. These include integer and fractional quantum Hall states as well as symmetry broken phases and quantum ... More
Optical orientation and alignment of excitons in ensembles of inorganic perovskite nanocrystalsFeb 02 2018We demonstrate the optical orientation and alignment of excitons in a two-dimensional layer of CsPbI$_3$ perovskite nanocrystals prepared by colloidal synthesis and measure the anisotropic exchange splitting of exciton levels in the nanocrystals. From ... More
Ultrafast Response of Plasmonic NanostructuresFeb 02 2018Plasmonic metal nanostructures are an integral part of nanophotonic device applications owing to their ability to generate strong localized electromagnetic fields when illuminated from the far-field. These nanostructures can be prepared in the laboratory ... More
Coherent two-mode dynamics of a nanowire force sensorFeb 02 2018Classically coherent dynamics analogous to those of quantum two-level systems are studied in the setting of force sensing. We demonstrate quantitative control over the coupling between two orthogonal mechanical modes of a nanowire cantilever, through ... More
Electrically tunable dynamic nuclear spin polarization in GaAs quantum dots at zero magnetic fieldFeb 02 2018In III-V semiconductor nano-structures the electron and nuclear spin dynamics are strongly coupled. Both spin systems can be controlled optically. The nuclear spin dynamics is widely studied, but little is known about the initialization mechanisms. Here ... More
Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene SuperlatticesFeb 02 2018Van der Waals (vdW) heterostructures are an emergent class of metamaterials comprised of vertically stacked two-dimensional (2D) building blocks, which provide us with a vast tool set to engineer their properties on top of the already rich tunability ... More
How light absorption modifies the radiative force on a microparticle in optical tweezersFeb 02 2018Reflection and refraction of light can be used to trap small dielectric particles in the geometrical optics regime. Absorption of light is usually neglected in theoretical calculations, but it is known that it occurs in the optical trapping of metallic ... More
Nanomechanical characterization of the Kondo charge dynamics in a carbon nanotubeFeb 02 2018Using the transversal vibration resonance of a suspended carbon nanotube as a charge detector for its embedded quantum dot, we investigate the case of strong Kondo correlations between the quantum dot and its leads. We demonstrate that even when a large ... More
Bulk-boundary quantum oscillations in inhomogeneous Weyl semimetalsFeb 01 2018Weyl fermions in an external magnetic field exhibit the chiral anomaly, a non-conservation of chiral fermions. In a Weyl semimetal, a spatially inhomogeneous Weyl node separation causes similar effect by creating an intrinsic pseudo-magnetic field with ... More
Quantum anomalies in nodal line semimetalsFeb 01 2018Topological semimetals is a new class of condensed matter systems with nontrivial electronic structure topology. Their unusual observable properties may often be understood in terms of quantum anomalies. In particular, Weyl and Dirac semimetals, which ... More
Two-color Fermi liquid theory for transport through a multilevel Kondo impurityFeb 01 2018Feb 08 2018We consider a quantum dot with ${\cal K}{\geq} 2$ orbital levels occupied by two electrons connected to two electric terminals. The generic model is given by a multi-level Anderson Hamiltonian. The weak-coupling theory at the particle-hole symmetric point ... More
Manipulating spins of magnetic molecules: Hysteretic behavior with respect to bias voltageFeb 01 2018Formation of a magnetic hysteresis loop with respect to a bias voltage is investigated theoretically in a spin-valve device based on a single magnetic molecule. We consider a device consisting of two ferromagnetic electrodes bridged by a carbon nanotube, ... More
Vibronic Dephasing Model for Coherent-to-Incoherent Crossover in DNAFeb 01 2018Feb 02 2018In this work we investigate the interplay between coherent and incoherent charge transport in cytosine-guanine (GC) rich DNA molecules. Our objective is to introduce physically grounded approach to dephasing in large molecules and to understand the length ... More
Enhancing photon squeezing one Leviton at a timeFeb 01 2018A mesoscopic device in the simple tunnel junction or quantum point contact geometry emits microwaves with remarkable quantum properties, when subjected to a sinusoidal drive in the GHz range. In particular, single and two-photon squeezing as well as entanglement ... More
Lindbladians with multiple steady states: theory and applicationsJan 31 2018Markovian master equations, often called Liouvillians or Lindbladians, are used to describe decay and decoherence of a quantum system induced by that system's environment. While a natural environment is detrimental to fragile quantum properties, an engineered ... More
Skyrmion nucleation via localized spin current injection in confined nanowire geometry in low chirality magnetic materialsJan 31 2018Magnetic skyrmions have been the focus of intense research with promising applications in memory, logic and interconnect technology. Several schemes have been recently proposed and demonstrated to nucleate skyrmions. However, they either result in an ... More
Anatomy of the magnetic anisotropy energy mediated by tight-binding Rashba electronsJan 31 2018The magnetic anisotropy is a fundamental quantity, defining the orientational stability of the magnetic state. Due to its importance, many different approaches have been put forth to explain its properties and behavior, ranging from simple models to fully ... More
The spectrum of non-centrosymmetrically layered spherical cavity resonator. I.The mode decomposition methodJan 31 2018We develop a theoretical method for solving Maxwell's equations to obtain the frequency spectra of inhomogeneous and asymmetric cavity resonators using a couple of effective Debye-type potentials. The structure we study specifically is the layered spherical ... More
Field theoretic renormalization study of reduced quantum electrodynamics and applications to the ultra-relativistic limit of Dirac liquidsJan 31 2018The field theoretic renormalization study of reduced quantum electrodynamics (QED) is performed up to two loops. In the condensed matter context, reduced QED constitutes a very natural effective relativistic field theory describing (planar) Dirac liquids, ... More
Josephson effect in junctions of conventional and topological superconductorsJan 31 2018We present a theoretical analysis of the equilibrium Josephson current-phase relation in hybrid devices made of conventional s-wave spin-singlet superconductors (S) and topological superconductor (TS) wires featuring Majorana end states. Using Green's ... More
Comment on "Impurity spectra of graphene under electric and magnetic fields"Jan 31 2018In a recent publication [Phys. Rev. B $\textbf{89}$, 155403 (2014)], the authors investigated the spectrum of a Coulomb impurity in graphene in the presence of magnetic and electric fields using the coupled series expansion approach. In the first part ... More
Quantum rings with the Rashba spin-orbit interaction in the regime of strong light-matter couplingJan 30 2018We developed the theory of electronic properties of semiconductor quantum rings with the Rashba spin-orbit interaction irradiated by an off-resonant high-frequency electromagnetic field (dressing field). Within the Floquet theory of periodically driven ... More
Suggested design of gold-nanoobjects-based terahertz radiation source for biomedical researchJan 30 2018Gold nanoparticles (GNPs) may serve as "devices" to emit electromagnetic radiation in the terahertz (THz) range, whereby the energy is delivered by radio frequency or microwave photons which won't by themselves induce transitions between sparse confinement-shaped ... More
Massively parallel symplectic algorithm for coupled magnetic spin dynamics and molecular dynamicsJan 30 2018A parallel implementation of coupled spin-lattice dynamics in the LAMMPS molecular dynamics package is presented. The equations of motion for both spin only and coupled spin-lattice dynamics are first reviewed, including a detailed account of how magneto-mechanical ... More
Controlled spatial separation of spins and coherent dynamics in spin-orbit-coupled nanostructuresJan 30 2018The spatial separation of electron spins followed by the control of their individual spin dynamics has recently emerged as an essential ingredient in many proposals for spin-based technologies because it would enable both of the two spin species to be ... More
Novel circuit design for high-impedance and non-local electrical measurements of two-dimensional materialsJan 30 2018Two-dimensional materials offer a novel platform for the development of future quantum technologies. However, the electrical characterisation of topological insulating states, non-local resistance and bandgap tuning in atomically-thin materials, can be ... More
On-chip excitation of single germanium-vacancies in nanodiamonds embedded in plasmonic waveguidesJan 30 2018Monolithic integration of quantum emitters in nanoscale plasmonic circuitry requires low-loss plasmonic configurations capable of confining light well below the diffraction limit. We demonstrate on-chip remote excitation of nanodiamond-embedded single ... More
A Topological SQUIPT based on helical edge states in proximity to superconductorsJan 30 2018We propose a device based on a topological Josephson junction where the helical edge states of a two-dimensional topological insulator are in close proximity to two superconducting leads. The presence of a magnetic flux through the junction leads to a ... More
Non-Reciprocal Transmission and Reflection of a Chirally-Coupled Quantum DotJan 30 2018We report non-reciprocal transmission and reflection for quantum dot exciton spins coupled to nanophotonic waveguides. A clear dependence on propagation direction is found for a chirally-coupled quantum dot, with spin up and spin down exciton spins coupling ... More
Valley qubit in gated MoS$_2$ monolayer quantum dotJan 30 2018The aim of presented research is to design a nanodevice, based on a MoS$_2$ monolayer, performing operations on a well-defined valley qubit. We show how to confine an electron in a gate induced quantum dot within the monolayer, and to perform the NOT ... More
Edge on-site potential effects in a honeycomb topological magnon insulatorJan 30 2018The difference between the edge on-site potential and the bulk values in a magnonic topological honeycomb lattice leads to the formation of edge states in a bearded boundary, and the same difference is found to be the responsible for the absence of edge ... More
Strain engineering of the silicon-vacancy center in diamondJan 30 2018Jan 31 2018We control the electronic structure of the silicon-vacancy (SiV) color-center in diamond by changing its static strain environment with a nano-electro-mechanical system. This allows deterministic and local tuning of SiV optical and spin transition frequencies ... More
Optical Kerr Effect in Graphene: Theoretical Analysis of the Optical Heterodyne Detection TechniqueJan 29 2018Graphene is an atomically thin two-dimensional material demonstrating strong optical nonlinearities including harmonics generation, four wave mixing, Kerr and other nonlinear effects. In this paper we theoretically analyze the optical heterodyne detection ... More
On the Interpretation of Thermal Conductance of the nu=5/2 EdgeJan 29 2018Recent experiments [Banerjee et al, arXiv:1710.00492] have measured thermal conductance of the nu=5/2 edge in a GaAs electron gas and found it to be quantized as K \approx 5/2 (in appropriate dimensionless units). This result is unexpected, as prior numerical ... More
Real space mapping of topological invariants using artificial neural networksJan 29 2018Topological invariants allow to characterize Hamiltonians, predicting the existence of topologically protected in-gap modes. Those invariants are generically computed for infinite systems with trans- lational symmetry, by tracing the evolution of the ... More
Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systemsJan 29 2018Spin-orbit coupling in inversion-asymmetric magnetic crystals and structures has emerged as a powerful tool to generate complex magnetic textures, interconvert charge and spin under applied current, and control magnetization dynamics. Current-induced ... More
Theory of AC quantum transport with fully electrodynamic couplingJan 29 2018With the continued scaling of microelectronic devices along with the growing demand of high-speed wireless telecommunications technologies, there is increasing need for high-frequency device modeling techniques that accurately capture the quantum mechanical ... More
Electron scattering and conduction in doped semiconductors in simultaneous strong infrared radiation fieldJan 29 2018Electron scattering and conduction on various types of impurities in semiconductor can be calculated via the first order Born approximation when the electrons are considered as free particles described by plane waves. In the following we present analytic ... More
Realization of a double-slit SQUID geometry by Fermi arc surface states in a WTe$_2$ Weyl semimetalJan 29 2018We experimentally study electron transport between two superconducting indium leads, coupled to the WTe$_2$ crystal surface. WTe$_2$ is characterized by presence of Fermi arc surface states, as a predicted type-II Weyl semimetal candidate. We demonstrate ... More
Geometric rectification for nanoscale vibrational energy harvestingJan 29 2018Feb 06 2018In this work, we present a mechanism that, based on quantum-mechanical principles, allows one to recover kinetic energy at the nanoscale. Our premise is that very small mechanical excitations, such as those arising from sound waves propagating through ... More
Strain-engineered inverse charge-funnelling in layered semiconductorsJan 29 2018The control of charges in a circuit due to an external electric field is ubiquitous to the exchange, storage and manipulation of information in a wide range of applications, from electronic circuits to synapses in neural cells. Conversely, the ability ... More
Band-pass Fabry-Pèrot magnetic tunnel junctionsJan 29 2018Significant scientific and technological progress in the field of spintronics is based on trilayer magnetic tunnel junction devices which principally rely on the physics of single barrier tunneling. While technologically relevant devices have been prototyped, ... More
Realisation of a quantum heat valveJan 28 2018Feb 05 2018Quantum thermodynamics is emerging, both as a topic of fundamental research, but also as means to understand and potentially improve the performance of quantum devices. Superconducting circuit QED (Quantum Electro-Dynamics) presents a prominent platform ... More
Zeeman Splitting and Inverted Polarization of Biexciton Emission in Monolayer WS2Jan 28 2018We investigate the magnetic-field-induced splitting of biexcitons in monolayer WS$_2$ using polarization-resolved photoluminescence spectroscopy in out-of-plane magnetic fields up to 30 T. The observed $g$ factor of the biexciton amounts to $-3.89$, closely ... More
Random matrix approach to plasmon resonances in the random impedance network model of disordered nanocompositesJan 28 2018Random impedance networks are widely used as a model to describe plasmon resonances in disordered metal-dielectric and other two-component nanocomposites. In the present work, spectral properties of resonances in random networks are studied within a framework ... More
Bogoliubov de Gennes equation on metric graphsJan 28 2018We consider Bogoliubov de Gennes equation on metric graphs. The vertex boundary conditions providing self-adjoint realization of the Bogoliubov de Gennes operator on a metric star graph are derived. Secular equation providing quantization of the energy ... More
Hidden Symmetry of Flexoelectric CouplingJan 27 2018Considering the importance of the flexoelectric coupling for the physical understanding of the gradient-driven couplings in mesoscale and nanoscale solids, one has to determine its full symmetry and numerical values. The totality of available experimental ... More