Latest in cond-mat

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Active crystals on a sphereFeb 14 2018Two-dimensional crystals on curved manifolds exhibit nontrivial defect structures. Here, we consider "active crystals" on a sphere, which are composed of self-propelled colloidal particles. Our work is based on a new phase-field-crystal-type model that ... More
Measuring Electromagnetic and Gravitational Responses of Photonic Landau LevelsFeb 13 2018The topology of an object describes global properties that are insensitive to local perturbations. Classic examples include string knots and the genus (number of handles) of a surface: no manipulation of a closed string short of cutting it changes its ... More
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
Pair density wave, charge density wave and vortex in high Tc cupratesFeb 08 2018A recent scanning tunneling microscopy (STM) experiment reports the observation of charge density wave (CDW) with period of approximately 8a in the halo region surrounding the vortex core, in striking contrast to the approximately period 4a CDW that are ... More
A deep learning approach to identify local structures in atomic-resolution transmission electron microscopy imagesFeb 08 2018Recording atomic-resolution transmission electron microscopy (TEM) images is becoming increasingly routine. A new bottleneck is then analyzing this information, which often involves time-consuming manual structural identification. We have developed a ... 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
The Random Fractional Matching ProblemFeb 08 2018We consider two formulations of the random-link fractional matching problem, a relaxed version of the more standard random-link (integer) matching problem. In one formulation, we allow each node to be linked to itself in the optimal matching configuration. ... 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
Capillary-driven binding of thin triangular prisms at fluid interfacesFeb 08 2018We observe capillary-driven binding between thin, equilateral triangular prisms at a flat air-water interface. The edge length of the equilateral triangle face is 120 $\mu m$, and the thickness of the prism is varied between 2 and 20 $\mu m$. For thickness ... More
Neural-network Kohn-Sham exchange-correlation potential and its out-of-training transferabilityFeb 08 2018We incorporate in the Kohn-Sham self consistent equation a trained neural-network projection from the charge density distribution to the Hartree-exchange-correlation potential $n \rightarrow V_{\rm Hxc}$ for possible numerical approach to the exact Kohn-Sham ... More
Orbital Origin of Extremely Anisotropic Superconducting Gap in Nematic Phase of FeSe SuperconductorFeb 08 2018The iron-based superconductors are characterized by multiple-orbital physics where all the five Fe 3$d$ orbitals get involved. The multiple-orbital nature gives rise to various novel phenomena like orbital-selective Mott transition, nematicity and orbital ... More
The sum of log-normal variates in geometric Brownian motionFeb 08 2018Geometric Brownian motion (GBM) is a key model for representing self-reproducing entities. Self-reproduction may be considered the definition of life [5], and the dynamics it induces are of interest to those concerned with living systems from biology ... More
Suppression and revival of long-range ferromagnetic order in the multiorbital Fermi-Hubbard modelFeb 08 2018By means of dynamical mean-field theory allowing for complete account of SU(2) rotational symmetry of interactions between spin-1/2 particles, we observe a strong effect of suppression of ferromagnetic order in the multiorbital Fermi-Hubbard model in ... More
Anomalous phonon lifetime shortening in paramagnetic CrN caused by magneto-lattice coupling: A combined spin and ab initio molecular dynamics studyFeb 08 2018We study the mutual coupling of spin fluctuations and lattice vibrations in paramagnetic CrN by combining atomistic spin dynamics and ab initio molecular dynamics. The two degrees of freedom are dynamically coupled leading to non-adiabatic effects. Those ... 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
Spin-Orbital Excitations in Ca$_{2}$RuO$_4$ Revealed by Resonant Inelastic X-ray ScatteringFeb 08 2018The strongly correlated insulator Ca$_{2}$RuO$_4$ is considered as a paradigmatic realization of both spin-orbital physics and a band-Mott insulating phase, characterized by orbitally selective coexistence of a band and a Mott gap. We present a high-resolution ... More
Optical single photon detection in micron-scaled NbN bridgesFeb 08 2018We demonstrate experimentally that single photon detection can be achieved in micron-wide NbN bridges, with widths ranging from 0.53 $\mu$m to 5.15 $\mu$m and for photon-wavelengths from 408 nm to 1550 nm. The microbridges are biased with a dc current ... More
Numerical Algorithm for Exact Finite Temperature Spectra and Its Application to Frustrated Quantum Spin SystemsFeb 08 2018A numerical algorithm to calculate exact finite-temperature spectra of many-body lattice Hamiltonians is formulated by combining the typicality approach and the shifted Krylov subspace method. The combined algorithm, which we name finite-temperature shifted ... 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
Weak doping dependence of the antiferromagnetic coupling between nearest-neighbor Mn$^{2+}$ spins in (Ba$_{1-x}$K$_x$)(Zn$_{1-y}$Mn$_y$)$_2$As$_2$Feb 08 2018Dilute magnetic semiconductors (DMS) are nonmagnetic semiconductors doped with magnetic transition metals. The recently discovered DMS material (Ba$_{1-x}$K$_{x}$)(Zn$_{1-y}$Mn$_{y}$)$_{2}$As$_{2}$ offers a unique and versatile control of the Curie temperature, ... More
Properties of Superconducting Nb and NbTi Coatings-films Deposited by New Ionic-Plasma Clusters methodFeb 08 2018Originally developed technique based on generation of plasma-cluster flux emitted from cathode spots at surface of an integrally cold cathode has been applied for deposition of niobium superconductive (thick) film materials. Possibility for depositing ... More
Neural Network Renormalization GroupFeb 08 2018We present a variational renormalization group approach using deep generative model composed of bijectors. The model can learn hierarchical transformations between physical variables and renormalized collective variables. It can directly generate statistically ... More
Temperature-induced inversion of the spin-photogalvanic effect in WTe$_2$ and MoTe$_2$Feb 08 2018We investigate the generation and temperature-induced evolution of optically-driven spin photocurrents in WTe$_2$ and MoTe$_2$. By correlating the scattering-plane dependence of the spin photocurrents with the symmetry analysis, we find that a sizeable ... More
Comment on "Phase Control of Directed Diffusion in a Symmetric Optical Lattice"Feb 08 2018Comment on the paper Schiavoni et al., Phys. Rev. Lett. 90, 094101 (2003).
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
Exotic Magnetism and Spin-Orbit Assisted Mott Insulating State in a $3d-5d$ Double PerovskiteFeb 08 2018The magnetic structure of Ca$_2$MnReO$_6$ double perovskite is investigated by neutron powder diffraction and bulk magnetization, showing dominant non-collinear Mn magnetic moments [$4.35(7)$ $\mu_B$] that are orthogonally aligned with the small Re moments ... More
First-principles study of the thermoelectric properties of quaternary tetradymite BiSbSeTe2Feb 08 2018The electronic and phonon transport properties of quaternary tetradymite BiSbSeTe2 are investigated using first-principles approach and Boltzmann transport theory. Unlike the binary counterpart Bi2Te3, we obtain a pair of Rashba splitting bands induced ... More
Potential Energy Landscape of TIP4P/2005 waterFeb 08 2018We report an exhaustive numerical study of the statistical properties of the potential energy landscape of TIP4P/2005, one of the most accurate rigid water models. We show that, in the region where equilibrated configurations can be generated, a Gaussian ... More
Characterization, optical properties and electron(exciton)-phonon interaction in bulk In2Se3 crystals and InSe nanocrystals in In2nSe3 confinementFeb 08 2018Complex electron-microscopic, energy-dispersed and wide-temperature optical absorption and photoluminescence (PL) investigations are carried out into Bridgeman-grown layered In2Se3 crystals. It is shown that In2Se3 crystals as a whole have a homogeneous ... More
Optoelectronics and defect levels in hydroxyapatite by first-principlesFeb 08 2018Hydroxyapatite (HAp) is an important component of mammal bones and teeth, being widely used in prosthetic implants. Despite the importance of HAp in medicine, several promising applications involving this material e.g. in photo-catalysis), depend on how ... More
Transient dynamics of electric double layer capacitors: Exact expressions within the Debye-Falkenhagen approximationFeb 08 2018We revisit a classical problem of theoretical electrochemistry: the response of an electric double layer capacitor (EDLC) subject to a small, suddenly-applied external potential. We solve the Debye-Falkenhagen equation to obtain exact expressions for ... More
Hyperelastic constitutive modeling with exponential decay and application to a viscoelastic adhesiveFeb 08 2018Hyperelastic materials models are well established to describe the non-linear stress-strain relations of elastomers. In this paper, a polyurethane adhesive is considered as an exemplary material and subjected to tensile, compressive and shear tests. Conventional ... More
Evolution of defect signatures at ferroelectric domain walls in Mg-doped LiNbO3Feb 08 2018The domain structure of uniaxial ferroelectric lithium niobate single crystals is investigated using Raman spectroscopy mapping. The influence of doping with magnesium and poling at room temperature is studied by analysing frequency shifts at domain walls ... More
Electronic and optical properties of La-doped Sr$_3$Ir$_2$O$_7$ epitaxial thin-filmsFeb 08 2018We have investigated structural, transport, and optical properties of tensile strained (Sr$_{1-x}$La$_x$)$_3$Ir$_2$O$_7$ (x = 0, 0.025, 0.05) epitaxial thin-films. While High-T$_c$ superconductivity is predicted theoretically in the system, we have observed ... More
Thermoelectric properties of polycrystalline palladium sulfideFeb 08 2018A suite measurements of the electrical, thermal, and vibrational properties are conducted on palladium sulfide (PdS) in order to investigate its thermoelectric performance. The tetragonal structure with the space group $P$42/$m$ for PdS is determined ... More
Direct observation of spin excitation anisotropy in the paramagnetic orthorhombic state of BaFe$_{2-x}$Ni$_x$As$_2$Feb 08 2018We use transport and inelastic neutron scattering measurements to investigate single crystals of iron pnictide BaFe$_{2-x}$Ni$_{x}$As$_{2}$ ($x=0,0.03$), which exhibit a tetragonal-to-orthorhombic structural transition at $T_s$ and stripe antiferromagnetic ... More
Visualizing Heavy Fermion Confinement and Pauli-Limited Superconductivity in Layered CeCoIn5Feb 08 2018Layered material structures play a key role in enhancing electron-electron interactions to create correlated metallic phases that can transform into unconventional superconducting states. The quasi-two-dimensional electronic properties of such compounds ... More
Folding mechanisms at finite temperatureFeb 08 2018Folding mechanisms are zero elastic energy motions essential to the deployment of origami, linkages, reconfigurable metamaterials and robotic structures. In this paper, we determine the fate of folding mechanisms when such structures are miniaturized ... More
A strongly interacting Sarma superfluid near orbital Feshbach resonancesFeb 08 2018We investigate the nature of superfluid pairing in a strongly interacting Fermi gas near orbital Feshbach resonances with spin-population imbalance in three dimensions, which can be well described by a two-band or two-channel model. We show that a Sarma ... 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
Theory and Ab Initio Computation of the Anisotropic Light Emission in Monolayer Transition Metal DichalcogenidesFeb 07 2018Monolayer transition metal dichalcogenides (TMDCs) are direct gap semiconductors with unique potential for ultrathin light emitters. Yet, their photoluminescence (PL) is not completely understood. We compute the radiative recombination rate in monolayer ... More
Stochastic control in microscopic nonequilibrium systemsFeb 07 2018Quantifying energy flows at nanometer scales promises to guide future research in a variety of disciplines, from microscopic control and manipulation, to autonomously operating molecular machines. A general understanding of the thermodynamic costs of ... More
Colossal magnetoresistance in a Mott insulator via magnetic field-driven insulator-metal transitionFeb 07 2018We present a new type of colossal magnetoresistance (CMR) arising from an anomalous collapse of the Mott insulating state via a modest magnetic field in a bilayer ruthenate, Ti-doped Ca$_3$Ru$_2$O$_7$. Such an insulator-metal transition is accompanied ... More
Assembling single colloidal crystals in inverted micro-fluidic pumpsFeb 07 2018We propose a simple seedless approach to assemble millimeter sized monolayer single colloidal crystals with desired orientations at predetermined locations on an unstructured charged substrate. This approach utilizes the millimeter-ranged fluid flow on ... More
Lorentz breaking fixed points in Dirac and Weyl semimetalsFeb 07 2018We perform a renormalization group analysis of Coulomb interaction in anisotropic Weyl semimetals (non--circular or tilted Weyl cones). We find that the Fermi velocities and the speed of light do not reach a common value at the fixed point. Moreover, ... More
Landau theory for magnetic and structural transitions in CeCo$_{0.85}$Fe$_{0.15}$SiFeb 07 2018We present a phenomenological analysis of the magnetoelastic properties of CeCo$_{0.85}$Fe$_{0.15}$Si at temperatures close to the N\'eel transition temperature $T_N$. Using a Landau functional we provide a qualitative description of the thermal expansion, ... More
Multipartite entanglement in spin chains and the HyperdeterminantFeb 07 2018A way to characterize multipartite entanglement in pure states of a spin chain with $n$ sites and local dimension $d$ is by means of the Cayley hyperdeterminant. The latter quantity is a polynomial constructed with the components of the wave function ... More
Superfluid density of a photo-induced superconducting stateFeb 07 2018Nonequilibrium conditions offer novel routes to superconductivity that are not available at equilibrium. For example, by engineering nonequilibrium electronic populations, pairing may develop between electrons in different energy bands. A concrete proposal ... More
Quantum edge modes in 3d gravity and 2+1d topological phases of matterFeb 07 2018We analyze the edge mode structure of Euclidean three dimensional gravity from within the quantum theory as embodied by a Ponzano-Regge-Turaev-Viro discrete state sum with Gibbons-=-Hawking-York boundary conditions. This structure is encoded in a pair ... 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
Orbital Transition in the Parent Spin-Orbit Mott Insulator Sr2IrO4Feb 07 2018The crystal lattice and vibrations of Sr2IrO4 were probed by a combined phonon Raman scattering and x-ray powder diffraction experiment at P < 45 GPa. Anomalies in phonon Raman intensities, energies and linewidths were observed at 17, 30 and 40 GPa with ... 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
Correlations of occupation numbers in the canonical ensemble and application to BEC in a 1D harmonic trapFeb 07 2018We study statistical properties of $N$ non-interacting identical bosons or fermions in the canonical ensemble. We derive several general representations for the $p$-point correlation function of occupation numbers $\overline{n_1\cdots n_p}$. We demonstrate ... More
Wrinkles, folds and plasticity in granular raftsFeb 07 2018We investigate the mechanical response of a compressed monolayer of large and dense particles at a liquid-fluid interface: a granular raft. Upon compression, rafts first wrinkle; then, as the confinement increases, the deformation localizes in a unique ... More
In aqua electrochemistry probed by XPEEM: experimental setup, examples, and challengesFeb 07 2018Recent developments in environmental and liquid cells equipped with electron transparent graphene windows have enabled traditional surface science spectromicroscopy tools, such as X-ray photoelectron spectroscopy (XPS), photoemission electron microscopy ... 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
Spin-charge separation and many-body localizationFeb 07 2018Many body localization for a disordered chain of spin 1/2 fermions is discussed. Following [Phys. Rev. B \textbf{94}, 241104 (2016)], we discuss the case of correlated disorder for both spin components, a system that leads to density (charge) localization ... More
Towards Understanding the Structure, Dynamics and Bio-activity of Diabetic Drug MetforminFeb 07 2018Small molecules are often found to exhibit extraordinarily diverse biological activities. Metformin is one of them. It is widely used as anti-diabetic drug for type-two diabetes. In addition to that, metformin hydrochloride shows anti-tumour activities ... More
Control of surface potential at polar domain walls in a nonpolar oxideFeb 07 2018Ferroic domain walls could play an important role in microelectronics, given their nanometric size and often distinct functional properties. Until now, devices and device concepts were mostly based on mobile domain walls in ferromagnetic and ferroelectric ... More
Origin of Pseudo-Stability in Stress-Induced Damage Evolution ProcessesFeb 07 2018Feb 08 2018In this work we demonstrate that during a stress-induced damage evolution process where the stress field depends on the spatial structure of a system, the measured average value is not always representative of the true value of a system parameter. Such ... 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
Forceless Sadowsky strips are sphericalFeb 07 2018We show that thin rectangular ribbons, defined as energy-minimising configurations of the Sadowsky functional for narrow developable elastic strips, have a propensity to form spherical shapes in the sense that forceless solutions lie on a sphere. This ... More
Local Self-Energies for V and Pd Emergent from a Non-Local LDA+FLEX ImplementationFeb 07 2018In the spirit of recently developed LDA+U and LDA+DMFT methods we implement a combination of density functional theory in its local density approximation (LDA) with a $k$- and $\omega -$dependent self-energy found from diagrammatic fluctuational exchange ... More
Coupling between Spin and Charge Order Driven by Magnetic Field in Triangular Ising System LuFe2O4+δFeb 07 2018We present a study of the magnetic-field effect on spin correlations in the charge ordered triangular Ising system LuFe2O4+{\delta} through single crystal neutron diffraction. In the absence of a magnetic field, the strong diffuse neutron scattering observed ... 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
Structure, magnetic and transport properties of epitaxial thin films of equiatomic CoFeMnGe quaternary Heusler alloyFeb 07 2018Future spintronics requires the realization of thin film of half-metallic ferromagnets having high Curie temperature and 100\% spin polarization at the Fermi level for potential spintronics applications. In this paper, we report the epitaxial thin films ... More
Analysis of stochastic bifurcations with phase portraitsFeb 07 2018We propose a method to obtain phase portraits for stochastic systems. Starting from the Fokker-Planck equation, we separate the dynamics into a convective and a diffusive part. We show that stable and unstable fixed points of the convective field correspond ... More
Management of the Correlations of Ultracold Bosons in Triple WellsFeb 07 2018Ultracold interacting atoms are an excellent tool to study correlation functions of many-body systems that are generally eluding detection and manipulation. Herein, we investigate the ground state of bosons in a tilted triple-well potential and characterize ... More
Critical phases in the raise and peel modelFeb 07 2018The raise and peel model (RPM) is a nonlocal stochastic model describing the space and time fluctuations of an evolving one dimensional interface. Its relevant parameter $u$ is the ratio between the rates of local adsorption and nonlocal desorption processes ... More
Depth dependant element analysis of PbMg$_{1/3}$Nb$_{2/3}$O$_{3}$ using muonic X-raysFeb 07 2018The relaxor PbMg$_{1/3}$Nb$_{2/3}$O$_{3}$ (PMN) has received attention due to its potential applications as a piezoelectric when doped with PbTiO$_{3}$ (PT). Previous results have found that there are two phases existing in the system, one linked to the ... More
Depth dependant element analysis of PbMg$_{1/3}$Nb$_{2/3}$O$_{3}$ using muonic X-raysFeb 07 2018Feb 08 2018The relaxor PbMg$_{1/3}$Nb$_{2/3}$O$_{3}$ (PMN) has received attention due to its potential applications as a piezoelectric when doped with PbTiO$_{3}$ (PT). Previous results have found that there are two phases existing in the system, one linked to the ... More
Organic crystalline polymers: structural properties and way to synthesis under high pressureFeb 07 2018We consider different structures, which can be obtained by polymerization of aromatic organic molecules under high pressures. These 2D and 3D covalently bonded organic polymers and their functionalization can pave the way to production of energy storage ... More
Excitonic magnet in external field: complex order parameter and spin currentsFeb 07 2018We investigate spin-triplet exciton condensation in the two-orbital Hubbard model close to half filling by means of dynamical mean-field theory. Employing an impurity solver that handles complex off-diagonal hybridization functions, we study the behavior ... 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
Activity induced synchronizationFeb 07 2018Synchronization, the emergence of temporally coordinated behavior in large populations of interacting elements, occurs on many different length scales, from biological to social systems, generating phenomena like the unison flashing of fireflies, the ... More
Stability and Carrier Transport Properties of Phosphorene Based Polymorphic NanoribbonsFeb 07 2018A few-layer black phosphorene has recently gained significant interest in the scientific community. In this paper, we consider several polymorphs of phosphorene nanoribbons (PNRs) and employ deformation potential theory within the effective mass approximation ... More
Large-deviation Properties of Linear-programming Computational Hardness of the Vertex Cover ProblemFeb 07 2018The distribution of the computational cost of linear-programming (LP) relaxation for vertex cover problems on Erdos-Renyi random graphs is evaluated by using the rare-event sampling method. As a large-deviation property, differences of the distribution ... More
Stability of boron-doped graphene/copper interface: DFT, XPS and OSEE studiesFeb 07 2018Two different types of boron-doped graphene/copper interfaces synthesized using two different flow rates of Ar through the bubbler containing the boron source were studied. X-ray photoelectron spectra (XPS) and optically stimulated electron emission (OSEE) ... More
Natural Orbital-Based Lanczos Method for Anderson Impurity ModelsFeb 07 2018We implement the Lanczos algorithm on natural orbital basis to solve the zero-temperature Green's function of Anderson impurity models, following the work of Y. Lu, M. H\"{o}ppner, O. Gunnarsson, and M. W. Haverkort, Phys. Rev. B {\bf 90} (2014) 085102. ... More
Catalysis by metallic nanoparticles in solution: Thermosensitive microgels as nanoreactorsFeb 07 2018Metallic nanoparticles have been used as catalysts for various reactions, and the huge literature on the subject is hard to overlook. In many applications, the nanoparticles must be affixed to a colloidal carrier for easy handling during catalysis. These ... More
A structural test for the conformal invariance of the critical 3d Ising modelFeb 07 2018How can a renormalization group fixed point be scale invariant without being conformal? Polchinski (1988) showed that this may happen if the theory contains a virial current -- a non-conserved vector operator of dimension exactly $(d-1)$, whose divergence ... 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
Surface reconstruction, premelting, and collapse of open-cell nanoporous Cu via thermal annealingFeb 07 2018We systematic investigate the collapse of a set of open-cell nanoporous Cu (np-Cu) with the same porosity and shapes, but different specific surface area, during thermal annealing, via performing large-scale molecular dynamics simulations. Surface premelting ... More
High Pressure and Road to Room Temperature SuperconductivityFeb 07 2018High pressure serves as a path finding tool towards novel structures, including those with very high Tc.The superconductivity in sulfur hydrides with record value (203 K) is caused by the phonon mechanism. However, the picture differs from the conventional ... 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
Loop currents from nonunitary chiral superconductivity on the honeycomb latticeFeb 07 2018We study a tight-binding model of chiral d-wave superconductivity on the honeycomb lattice. The nearest-neighbor pairing ensures a nontrivial sublattice structure and nonunitarity of the superconducting pairing potential. We show that it generates persistent ... More
Twelve Inequivalent Dirac Cones in Two-Dimensional ZrB2Feb 07 2018Theoretical evidence of the existence of 12 inequivalent Dirac cones at the vicinity of the Fermi energy in monolayered ZrB$_2$ is presented. Two-dimensional ZrB$_2$ is a mechanically stable d- and p-orbital compound exhibiting a unique electronic structure ... More
Quantum Phase Transitions in Proximitized Josephson JunctionsFeb 07 2018We study fermion-parity-changing quantum phase transitions (QPTs) in platform Josephson junctions. These QPTs, associated with zero-energy bound states, are rather widely observed experimentally. They emerge from numerical calculations frequently without ... More
Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQRFeb 07 2018We present the results of $^{75}$As nuclear magnetic resonance (NMR), nuclear quadrupole resonance (NQR), and resistivity measurements in KFe$_2$As$_2$ under pressure ($p$). The temperature dependence of the NMR shift, nuclear spin-lattice relaxation ... More
Visualizing Orbital-selective Quasiparticle Interference in the Hund's Metal State of FeSeFeb 06 2018High temperature superconductivity (HTS) in Cu-based materials is generated by strong electronic correlations due to proximity of the Mott insulator phase. By contrast, the undoped phase proximate to Fe-based HTS is never an insulator. But this striking ... More
Unitarity and Universality in non relativistic Conformal Field theoryFeb 06 2018We relate the notion of unitarity of a $SL(2,\mathbf{R})$ invariant field theory with that of a Schr\"odinger field theory using the fact that $SL(2,\mathbf{R})$ is a subgroup of Schr\"odinger group. Exploiting $SL(2,\mathbf{R})$ unitarity, we derive ... More
Dynamic regulation of resource transport induces criticality in multilayer networks of excitable unitsFeb 06 2018Past work has shown that the function of a network of excitable units can be enhanced if the network is in the `critical regime', where excitations are, one average, neither damped nor amplified. In this Letter, we show that resource transport dynamics ... 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
Fragile aspects of topological transition in lossy and parity-time symmetric quantum walksFeb 06 2018Quantum walks often provide telling insights about the structure of the system on which they are performed. In PT-symmetric and lossy dimer lattices, the topological properties of the band structure manifest themselves in the quantization of the mean ... More