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Neutron powder diffraction study on the non-superconducting phases of ThFeAsN$_{1-x}$O$_x$ ($x=0.15, 0.6$) iron pnictideJul 15 2019We use neutron powder diffraction to study on the non-superconducting phases of ThFeAsN$_{1-x}$O$_x$ with $x=0.15, 0.6$. In our previous results on the superconducting phase ThFeAsN with $T_c=$ 30 K, no magnetic transition is observed by cooling down ... More

Nature of carrier doping in T'-La1.8-xEu0.2SrxCuO4 studied by X-Ray Photoemission and Absorption SpectroscopyJul 14 2019Recently, hole-doped superconducting cuprates with the T'-structure La1.8-xEu0.2SrxCuO4 (LESCO) have attracted a lot of attention. We have performed x-ray photoemission and absorption spectroscopy measurements on as-grown and reduced T0-LESCO. Results ... More

Anomalous phase shift in a Josephson junction via an antiferromagnetic interlayerJul 14 2019The anomalous ground state phase shift in S/AF/S Josephson junctions in the presence of the Rashba SO-coupling is predicted and numerically investigated. It is found to be a consequence of the uncompensated magnetic moment at the S/AF interfaces. The ... More

High entropy alloy superconductors -- status, opportunities and challengesJul 14 2019High entropy alloys (HEAs) are a recently-opened research area in materials science and condensed matter physics. Although 3d-metal-based HEAs have already been the subject of many investigations, studies of HEA superconductors, which tend to be based ... More

Spin-triplet superconductivity in the paramagnetic UCoGe under pressure studied by $^{59}$Co NMRJul 14 2019A $^{59}$Co nuclear magnetic resonance (NMR) measurement was performed on the single-crystalline ferromagnetic (FM) superconductor UCoGe under a pressure of 1.09 GPa, where the FM state is suppressed and superconductivity occurs in the paramagnetic (PM) ... More

Strong Pairing in two dimensions: Pseudogap and other phenomenaJul 13 2019We analyze the Berezinskii-Kosterlitz-Thouless transition temperature $T_{\text{BKT}}$ as a function of attractive coupling strength $g$, in 2D superconductors, following earlier work on atomic Bose gases. As a calibration, we successfully address the ... More

Modeling the computer memory based on the ferromagnet/superconductor multilayersJul 13 2019A model of superconducting computer memory exploiting the orthogonal spin transfer (OST) in the pseudospin valve (PS) that is controlled by the three-terminal Josephson superconducting-ferromagnetic transistor (SFT) is developed. The building blocks of ... More

Imaging doubled shot noise in a Josephson scanning tunneling microscopeJul 12 2019We have imaged the current noise with atomic resolution in a Josephson scanning tunneling microscope with a Pb-Pb junction. By measuring the current noise as a function of applied bias, we reveal the change from single electron tunneling above the superconducting ... More

Critical Scaling and Aging near the Flux Line Depinning TransitionJul 12 2019We utilize Langevin molecular dynamics simulations to study dynamical critical behavior of magnetic flux lines near the depinning transition in type-II superconductors subject to randomly distributed attractive point defects. We employ a coarse-grained ... More

Evolution of Incommensurate Superstructure and Electronic Structure with Pb Substitution in (Bi$_{2-x}$Pb$_{x}$)Sr$_2$CaCu$_2$O$_{8+δ}$ SuperconductorsJul 12 2019High-quality Bi$_{2-x}$Pb$_{x}$Sr$_2$CaCu$_2$O$_{8+\delta}$ (Bi2212) single crystals have been successfully grown by the traveling solvent floating zone technique with a wide range of Pb substitution ($x=0-0.8$). The samples are characterized by transmission ... More

Coexistence of Majorana and topologically nontrivial Andreev bound states in 1D superconductorsJul 11 2019The unambiguous detection of Majorana bound states in nanowires and in magnetic atom chains is hindered by the possible presence of near-zero-energy Andreev bound states which have similar experimental signatures. These near-zero energy states are expected ... More

Superconductor to insulator transition in wafer-scale NbSe2Jul 11 2019Superconducting tunneling devices, such as Josephson junctions etc., that are made of triplet or topological superconductors may enable new functionalities compared to those conventional ones made of s-wave superconductors. The tunnel barrier, an insulating ... More

Interplay of topology and electron-electron interactions in Rarita-Schwinger-Weyl semimetalsJul 11 2019We study for the first time the effects of strong short-range electron-electron interactions in generic Rarita--Schwinger--Weyl semimetals hosting spin-3/2 electrons with linear dispersion at a four-fold band crossing point. The emergence of this novel ... More

Superconducting dome in doped 2D superconductors with broken inversion symmetryJul 11 2019We analyze an unconventional inter-subband paired phase in a 2D doped superconductor considering both systems with the inversion symmetry and with the inversion symmetry broken. We find that for a centro-symmetric system the inter-subband pairing can ... More

Automated analysis of single-tone spectroscopic data for cQED systemsJul 11 2019Physical systems for quantum computation require calibration of the control parameters based on their physical characteristics by performing a chain of experiments that gather most precise information about the given device. It follows that there is a ... More

Anomalous anisotropic behaviour of spin-triplet proximity effect in Au/SrRuO$_3$/Sr$_2$RuO$_4$ junctionsJul 11 2019Spin-polarized supercurrents can be generated with magnetic inhomogeneity at a ferromagent/spin-singlet-superconductor interface. In such systems, complex magnetic inhomogeneity makes it difficult to functionalize the spin-polarized supercurrents, and ... More

Imaging pinning and expulsion of individual superconducting vortices in amorphous MoSi thin filmsJul 11 2019We use a scanning nanometer-scale superconducting quantum interference device (SQUID) to image individual vortices in amorphous superconducting MoSi thin films. Spatially resolved measurements of the magnetic field generated by both vortices and Meissner ... More

Electron energy relaxation in disordered superconducting NbN filmsJul 11 2019We report on the energy relaxation of electrons studied by means of magnetoconductance and photoresponse in a series of superconducting NbN film with thickness in the range from 3 to 33 nm. The inelastic scattering rate of electrons on phonons obeys T^n ... More

Ground state of the three-dimensional BCS d-wave superconductorJul 11 2019We determine the mean-field ground state of the three-dimensional rotationally symmetric d-wave ($\ell=2$) superconductor at weak coupling. It is a non-inert state, invariant under the symmetry $C_{2}$ only, which breaks time reversal symmetry almost ... More

Efficient quasiparticle traps with low dissipation through gap engineeringJul 10 2019Quasiparticles represent an intrinsic source of perturbation for superconducting qubits, leading to both dissipation of the qubit energy and dephasing. Recently, it has been shown that normal-metal traps may efficiently reduce the quasiparticle population ... More

Superconducting phase diagrams of LuB$_{12}$ and Lu$_{1-x}$Zr$_x$B$_{12}$ ($x \le 0.45$) down to 50 mKJul 10 2019Lutetium dodecaboride LuB12 is a simple weak-coupling BCS superconductor with critical temperature Tc = 0.42 K, whilst ZrB12 is a strong-coupling BCS superconductor with the highest critical temperature Tc = 6.0 K among this group of materials. In case ... More

Tuning the superconducting transition of SrTiO$_3$-based 2DEGs with lightJul 10 2019The resistivity of the two dimensional electron gas that forms at the interface of strontium titanate with various oxides is sensitive to irradiation with visible light. In this letter we present data on the interface between the band gap insulators LaAlO$_3$ ... More

Unique defect structure and advantageous vortex pinning properties in superconducting CaKFe4As4Jul 10 2019The lossless current-carrying capacity of a superconductor is limited by its critical current density (Jc). A key to enhance Jc towards real-life applications is engineering defect structures to optimize the pinning landscape. For iron-based superconductors ... More

Single origin of the nodal and antinodal gaps in cupratesJul 10 2019Recent angle-resolved photoemission electron spectroscopy (ARPES) experiments demonstrate that the momentum dependence of the spectral gap in underdoped cuprates does not follow a pure $d$-wave form [H. Anzai et a., Nat. Comm. {\bf 4}, 1815 (2013)]. This ... More

Exploring Topological Superconductivity in Topological MaterialsJul 10 2019The exploration of topological superconductivity and Majorana zero modes has become a rapidly developing field. Many types of proposals to realize topological superconductors have been presented, and significant advances have been recently made. In this ... More

Parting the Fermi Sea at the Mott Point: Dynamics of Correlated Electrons Reveals the Mechanism Underpinning MottnessJul 09 2019By increasing the interaction among conduction electrons, a Fermi-liquid-type metal turns into a Mott insulator. This first-order phase transition should exhibit a regime where the adjacent ground states coexist, leading to electronic phase separation, ... More

Topological superconductivity from transverse optical phonons in oxide heterostructuresJul 09 2019A topological superconductor features at its boundaries and vortices Majorana fermions, which are potentially applicable for topological quantum computations. The scarcity of the known experimentally verified physical systems with topological superconductivity, ... More

Topological superconductivity from transverse optical phonons in oxide heterostructuresJul 09 2019Jul 10 2019A topological superconductor features at its boundaries and vortices Majorana fermions, which are potentially applicable for topological quantum computations. The scarcity of the known experimentally verified physical systems with topological superconductivity, ... More

Linking the pseudo-gap in the cuprates with local symmetry breaking: a commentaryJul 09 2019Perspective on S. Mukhopadhyay, et al. Evidence for a vestigial nematic state in the cuprate pseudogap phase, PNAS 116, 13249 (2019); arXiv:1904.00915.

Josephson Detection of Time Reversal Symmetry Breaking $s\pm is^{\prime}$ Superconductivity in SnTe NanowiresJul 09 2019Exotic superconductivity, such as high T$_C$, topological, and heavy-fermion superconductors, often rely on phase sensitive measurements to determine the underlying pairing. Here we investigate the proximity-induced superconductivity in nanowires of SnTe, ... More

Rabi oscillations in a superconducting nanowire circuitJul 09 2019We investigate the circuit quantum electrodynamics of superconducting nanowire oscillators. The sample circuit consists of a capacitively shunted nanowire with a width of about 20 nm and a varying length up to 350 nm, capacitively coupled to an on-chip ... More

Two-Gap Superconductivity in CaFe_{0.88}Co_{0.12}AsF Revealed by Temperature Dependence of the Lower Critical Field H_{c1}^c(T)Jul 09 2019Gap symmetry and structure are crucial issues in understanding the superconducting mechanism of unconventional superconductors. Here we report an in-depth investigation on the out-of-plane lower critical field $H_{c1}^{c}$ of fluorine-based 1111 system ... More

Multiple gaps revealed by low temperature specific heat in the 1111-type CaFe_{0.88}Co_{0.12}AsF single crystalsJul 09 2019Low-temperature specific heat (SH) is measured on the 1111-type CaFe_{0.88}Co_{0.12}AsF single crystals under different magnetic fields. A clear SH jump with the height \Delta C/T|_Tc = 10.4 mJ/mol K^2 was observed at the superconducting transition temperature ... More

Nodeless s-wave superconductivity in the α-Mn structure type noncentrosymmetric superconductor TaOs: A μSR studyJul 09 2019Noncentrosymmetric superconductors can lead to a variety of exotic properties in the superconducting state such as line nodes, multigap behavior, and time-reversal symmetry breaking. In this paper, we report the properties of the new noncentrosymmetric ... More

Time-Reversal Invariant Superconductivity of Sr$_{2}$RuO$_{4}$ Revealed by Josephson EffectsJul 09 2019Sr$_{2}$RuO$_{4}$ is one of the most promising candidates of a topological superconductor with broken time-reversal symmetry, because a number of experiments have revealed evidences for a spin-triplet chiral $p$-wave superconductivity. In order to clarify ... More

Classifying induced superconductivity in atomically thin Dirac-cone materialsJul 08 2019Recently, Kayyalha et al. (2019 Phys. Rev. Lett. 122 047003) reported on anomalous enhancement of the self-field critical currents, Ic(sf,T), at low temperatures in Nb/BiSbTeSe2-nanoribbon/Nb Josephson junctions. The enhancement was attributed to the ... More

Coexisting spin resonance and long-range magnetic order of Eu in EuRbFe$_4$As$_4$Jul 08 2019Magnetic excitations and magnetic structure of EuRbFe$_4$As$_4$ were investigated by inelastic neutron scattering (INS), neutron diffraction, and random phase approximation (RPA) calculations. Below the superconducting transition temperature $T_\text{c}=36.5$~K, ... More

First-principles calculation of the electronic nematicity in FeSeJul 08 2019We report a density functional theory calculation that produces the nonmagnetic electronic nematic state in FeSe, without explicit breaking of the tetragonal lattice symmetry. We incorporate orbital-resolved interactions by +U and hybrid functional, and ... More

Phase evolution and superconductivity enhancement in Se-substituted MoTe$_2$ thin filmsJul 08 2019The strong spin$-$orbit coupling (SOC) and numerous crystal phases in few$-$layer transition metal dichalcogenides (TMDCs) MX$_2$ (M$=$W, Mo, and X$=$Te, Se, S) has led to a variety of novel physics, such as Ising superconductivity and quantum spin Hall ... More

Stability of the coexistence phase of chiral superconductivity and noncollinear spin ordering with a nontrivial topology and strong electron correlationsJul 08 2019We show that the quantum charge and spin fluctuations, while sufficiently renormalizing the magnetic order parameter, do not destroy the coexistence phase of chiral d+id superconductivity and 120-degree spin ordering in a strongly correlated 2D system ... More

Lower critical field measurement of NbN multilayer thin film superconductor at KEKJul 08 2019The multilayer thin film structure of the superconductor has been proposed by A. Gurevich to enhance the maximum gradient of SRF cavities. The lower critical field Hc1 at which the vortex starts penetrating the superconducting material will be improved ... More

Thermodynamic Investigation of Metamagnetism in Pulsed High Magnetic Fields on Heavy Fermion Superconductor UTe$_2$Jul 05 2019We investigated the thermodynamic property of the heavy fermion superconductor UTe$_2$ in pulsed high magnetic fields. The superconducting transition in zero field was observed at $T_{\rm c}$=1.65 K as a sharp heat capacity jump. Magnetocaloric effect ... More

Quantum dynamics of quasicharge in an ultrahigh-impedance superconducting circuitJul 05 2019Josephson effect is usually taken for granted because quantum fluctuations of the superconducting phase-difference are stabilized by the low-impedance embedding circuit. To realize the opposite regime, we shunt a weak Josephson junction with a nearly ... More

A topological Josephson junction platform for creating, manipulating, and braiding Majorana bound statesJul 05 2019As part of the intense effort towards identifying platforms in which Majorana bound states can be realized and manipulated to perform qubit operations, we propose a topological Josephson junction architecture that achieves these capabilities and which ... More

Photonic heat transport across a Josephson junctionJul 05 2019We present a detailed study of photonic heat transport across a Josephson junction coupled to two arbitrary linear circuits having different temperatures. First, we consider linear approximation, in which non-linear Josephson potential is replaced by ... More

Perpendicular Andreev reflection: Solid state signature of black hole horizonJul 04 2019Beenakker noticed that the peculiar band structure of Dirac fermions in 2D solids allows for the specular Andreev reflection in these systems which has no analogue in other 2D electron systems. An interesting deformation of the Dirac equation in the solid ... More

Mechanism of High-Temperature Superconductivity in Correlated-Electron SystemsJul 04 2019It is very important to elucidate the mechanism of superconductivity for achieving room temperature superconductivity. This paper is a short review article on the mechanism of high-temperature superconductivity. In the first half of this paper, we give ... More

NbSeTe -A New Layered Transition Metal Dichalcogenide SuperconductorJul 04 2019Transition metal dichalcogenides (TMDCs) usually exhibit layered polytypic structures due to the weak interlayer coupling. 2H-NbSe2 is one of the most widely studied in the pristine TMDC family due to its high superconducting transition temperature (Tc ... More

Electromagnetic radiation detectors based on Josephson junctions: Effective HamiltonianJul 03 2019We theoretically analyze two setups of low energy single-photon counters based on Josephson junctions (JJ). For this, we propose two simple and general models, based on the macroscopic quantum tunneling formalism (MQT). The first setup is similar to the ... More

Effect of Zeeman coupling on the Majorana vortex modes in iron-based topological superconductorsJul 03 2019In the superconducting regime of FeTe$_{(1-x)}$Se$_x$, there exist two distinct types of vortices: topological and trivial. To understand their distinction, we examine the interplay of Zeeman coupling and symmetry-allowed superconducting pairings in three-dimensional ... More

Majorana corner and hinge modes in second-order topological insulator-superconductor heterostructuresJul 03 2019As platforms of Majorana modes, topological insulator (quantum anomalous Hall insulator)/superconductor (SC) heterostructures have attracted tremendous attention over the past decade. Here we substitute the topological insulator by its higher-order counterparts. ... More

Period 4 stripe in the extended two-dimensional Hubbard modelJul 03 2019We study the competition between stripe states with different periods and a uniform $d$-wave superconducting state in the extended 2D Hubbard model at 1/8 hole doping using infinite projected entangled-pair states (iPEPS). With increasing strength of ... More

A modular point contact spectroscopy probe for sub-Kelvin applicationsJul 03 2019We present the construction and performance of a plug-n-play type point contact spectroscopy probe equipped with a piezo-driven coarse approach mechanism for sub-kelvin applications. A modular assembly has been built which can be placed in or taken out ... More

The Unusual Suppression of Superconducting Transition Temperature in Double-Doping 2H-NbSe$_2$Jul 03 20192H-NbSe2 is one of the most widely researched transition metal dichalcogenide (TMD) superconductors, which undergoes charge-density wave (CDW) transition at TCDW about 33 K and superconducting transition at Tc of 7.3 K. To explore the relation between ... More

Precision measurements of the AC field dependence of the superconducting transition in strontium titanateJul 03 2019Strontium titanate has resurfaced as a material prompting vigorous debate about the origin of its superconductivity in the extremely low carrier concentration regime. Here, we used simultaneous AC susceptibility and transport methods to explore the superconducting ... More

Interference of chiral Andreev edge statesJul 03 2019Jul 09 2019The search for topological excitations such as Majorana fermions has spurred interest in the boundaries between distinct quantum states. Here, we explore the interface between two prototypical phases of electronic matter with conceptually different ground ... More

Interference of chiral Andreev edge statesJul 03 2019The search for topological excitations such as Majorana fermions has spurred interest in the boundaries between distinct quantum states. Here, we explore the interface between two prototypical phases of electronic matter with conceptually different ground ... More

Enhanced $T_c$ and multiband superconductivity in the fully-gapped ReBe$_{22}$ superconductorJul 02 2019In search of the origin of superconductivity in diluted rhenium superconductors and their significantly enhanced $T_c$ compared to pure Be (0.026 K), we investigated the intermetallic ReBe$_{22}$ compound, mostly by means of muon-spin rotation/relaxation ... More

Topological Superconductivity in Doped Symmetry Protected Topological StateJul 02 2019Strongly interacting fermionic system can form nontrivial Mott insulators whose spin degrees of freedom form bosonic symmetry protected topological (SPT) state. We propose an exotic scenario that topological superconductivity can emerge in such a state ... More

The importance of thermal gradients on the vortex dynamics and magnetic behavior of mesoscopic superconducting samplesJul 01 2019Usually, the measurements of electronic and magnetic properties of superconducting samples are carried out under a constant temperature bath. On the other hand, thermal gradients induce local variation of the superconducting order parameter, and the vortex ... More

Control of dopant crystallinity in electrochemically treated cuprate thin filmsJul 01 2019We present a methodology based on \textit{ex-situ} (post-growth) electrochemistry to control the oxygen concentration in thin films of the superconducting oxide La$_2$CuO$_{4+y}$ grown epitaxially on substrates of isostructural LaSrAlO$_4$. The superconducting ... More

Bulk superconductivity and role of fluctuations in the iron-based superconductor FeSe at high pressuresJul 01 2019The iron-based superconductor FeSe offers a unique possibility to study the interplay of superconductivity with purely nematic as well magnetic-nematic order by pressure (p) tuning. By measuring specific heat under p up to 2.36GPa, we study the multiple ... More

On-demand thermoelectric generation of equal-spin Cooper pairsJul 01 2019Jul 08 2019Superconducting spintronics is based on the creation of spin-triplet Cooper pairs in ferromagnet-superconductor (F-S) hybrid junctions. Previous proposals to manipulate spin-polarized supercurrents on-demand typically require the ability to carefully ... More

On-demand thermoelectric generation of equal-spin Cooper pairsJul 01 2019Superconducting spintronics is based on the creation of spin-triplet Cooper pairs in ferromagnet-superconductor (F-S) hybrid junctions. Previous proposals to manipulate spin-polarized supercurrents on-demand typically require the ability to carefully ... More

A new Majorana platform in an Fe-As bilayer superconductorJul 01 2019Recently, iron-chalcogenide superconductors have emerged as a new and promising platform for studying and manipulating Majorana zero mode (MZM). By combining topological band structure and superconductivity in a multiband material, they provide significant ... More

Doping dependence of electromagnetic response in cuprate superconductorsJul 01 2019The study of the electromagnetic response in cuprate superconductors plays a crucial role in the understanding of the essential physics of these materials. Here the doping dependence of the electromagnetic response in cuprate superconductors is studied ... More

Influence of scattering on optical response of superconductivityJul 01 2019By using the gauge-invariant kinetic equation, we analytically investigate the influence of the scattering on the optical properties of superconductors in the normal-skin-effect region. Both linear and second-order responses are studied under a multi-cycle ... More

Spin currents driven by the Higgs mode in magnetic superconductorsJul 01 2019Higgs mode in superconducting materials describes slowly-decaying oscillations of the order parameter amplitude. We demonstrate that in magnetic superconductors with built-in spin-splitting field Higgs mode is strongly coupled to the spin degrees of freedom ... More

Evaluating Superconductors through Current Induced DepairingJun 30 2019The phenomenon of superconductivity occurs in the phase space of three principal parameters: temperature T, magnetic field B, and current density Jd . The critical temperature Tc is one of the first parameters that is measured and in a certain way defines ... More

Dissipative-regime measurements as a tool for confirming and characterizing near-room-temperature superconductivityJun 30 2019The search for new superconducting materials approaching room temperature benefits from having a variety of testing methodologies to confirm and characterize the presence of superconductivity. Often the first signatures of new superconducting species ... More

Hyperuniform vortex patterns at the surface of type-II superconductorsJun 30 2019A many-particle system must posses long-range interactions in order to be hyperuniform at thermal equilibrium. Hydrodynamic arguments and numerical simulations show, nevertheless, that a three-dimensional elastic-line array with short-ranged repulsive ... More

Superconducting phase diagram and nontrivial band topology of structurally modulated Sn$_{1-x}$Sb$_{x}$Jun 30 2019We report the discovery of superconductivity in binary alloy Sn$_{1-x}$Sb$_{x}$ with $x$ in the range of 0.43 to 0.6, which possesses a modulated rhombohedral structure due to the incommensurate ordering of Sn and Sb layers along the $c$-axis. The specific ... More

A Power Efficient Artificial Neuron Using Superconducting NanowiresJun 29 2019With the rising societal demand for more information-processing capacity with lower power consumption, alternative architectures inspired by the parallelism and robustness of the human brain have recently emerged as possible solutions. In particular, ... More

Inter-qubit interaction mediated by collective modes in a linear array of three-dimensional cavitiesJun 29 2019A design of LEGO-like construction set that allows assembling of different linear arrays of three-dimensional (3D) cavities and qubits for circuit quantum electrodynamics (cQED) experiments has been developed. A study of electromagnetic properties of ... More

Flat Bands, Topology, and Superconductivity of "Magic" Honeycomb Network in TaS2Jun 28 2019We uncover a rich phenomenology of the self-organized honeycomb network superstructure of one-dimensional metals in a nearly-commensurate charge-density wave 1T-TaS2, which may play a significant role in understanding global topology of phase diagrams ... More

Electrostatics of a superinsulatorJun 28 2019In 1978, to explain quark confinement in hadrons, 't Hooft coined the notion of "superinsulator", a hypothetical ground state endowed with infinite electric resistance and representing thus an extreme opposite to a superconductor. In condensed matter, ... More

Structural phases of elemental Gallium: universal relations in type-I superconductorsJun 28 2019The temperature dependent measurements of the thermodynamic critical field and the specific heat for the pressure stabilized Ga-II phase of elemental Gallium are presented. The discussion of these and other Ga phases data in the context of elemental and ... More

Characterizing dielectric properties of ultra-thin films using superconducting coplanar microwave resonatorsJun 28 2019We present an experimental approach for cryogenic dielectric measurements on ultra-thin insulating films. Based on a coplanar microwave waveguide design we implement superconducting quarter-wave resonators with inductive coupling, which allows us to determine ... More

Frequency Fluctuations in Tunable Superconducting Microwave CavitiesJun 27 2019We present a model for measurements of the scattering matrix elements of tunable microwave cavities in the presence of resonant frequency fluctuations induced by fluctuations in the tuning parameter. We apply this model to the specific case of a two-sided ... More

Effect of non-local correlations on the electronic structure of LiFeAsJun 27 2019We investigate the role of non-local correlations in LiFeAs by exploring an ab-initio-derived multi-orbital Hubbard model for LiFeAs via the Two-Particle Self-Consistent (TPSC) approach. The multi-orbital formulation of TPSC approximates the irreducible ... More

Reveal the non-local coherent nature from a dissipative Majorana teleportationJun 27 2019The non-local coherent nature of the Majorana devices is one of the key factors for realizing decoherence-free topological qubits. Direct observation of this coherent nature could provide a first-step benchmarking scheme to validate Majorana qubit quality. ... More

Study of electrical conductivity of the coverings of bimetallic Au-Ag nanoparticlesJun 27 2019"Metal" temperature course of electrical resistance of the coverings of bimetallic Au-Ag nanoparticles with the maintenance of silver from 6.6 % at. to 13.1 % at. is defined in the temperature range of 4.2-300 K. Features of low temperature resistance ... More

Study of electrical conductivity of the coatings of bimetallic Au-Ag nanoparticlesJun 27 2019Jul 03 2019The "metallic" temperature variation of the electrical resistivity of chemical nano gold-silver coatings with a silver content of 6.6 % at. up to 13.1 % at. determined in the temperature range 4.2-300 K. Features of low-temperature measurements of the ... More

Flux-induced Topological Superconductor in Planar Josephson JunctionJun 27 2019A planar Josephson junction with a normal metal attached on its top surface will form a hollow nanowire structure due to its three dimensional nature. In such hollow nanowire structure, the magnetic flux induced by a small magnetic field (about 0.01T) ... More

Evidence for singular-phonon-induced nematic superconductivity in a topological superconductor candidate Sr$_{0.1}$Bi$_2$Se$_3$Jun 27 2019Superconductivity mediated by phonons is typically conventional, exhibiting a momentum-independent s-wave pairing function, due to the isotropic interactions between electrons and phonons along different crystalline directions. Here, by performing inelastic ... More

Doping evolution of the charge excitations and electron correlations in electron-doped superconducting La$_{2-x}$Ce$_{x}$CuO$_{4}$Jun 26 2019Electron correlations play a dominant role in the charge dynamics of the cuprates. We use resonant inelastic x-ray scattering (RIXS) to track the doping dependence of the collective charge excitations in electron doped La$_{2-x}$Ce$_{x}$CuO$_{4}$(LCCO). ... More

Atomic limit and inversion-symmetry indicators for topological superconductorsJun 26 2019Symmetry indicators have proven to be extremely helpful in identifying topologically non-trivial crystalline insulators using symmetry-group representations of their Bloch states. An extension of this approach to superconducting systems requires defining ... More

Quantum critical scaling of the conductivity tensor at the metal-insulator transition in Nb$_{1-x}$Ti$_{x}$NJun 26 2019In contrast to the Landau paradigm, a metal-insulator transition (MIT), driven purely by competition between itinerance and localization and unaccompanied by any conventional (e.g, magnetic) order-disorder instabilities, admits no obvious local order ... More

3D integration and packaging for solid-state qubitsJun 26 2019Developing a packaging scheme that meets all of the requirements for operation of solid-state qubits in a cryogenic environment can be a formidable challenge. In this article, we discuss work being done in our group as well as in the broader community, ... More

Nanoscale Interlayer Defects in Iron ArsenidesJun 26 2019Using a local real-space microscopy probe, we discover evidence of nanoscale interlayer defects along the c-crystallographic direction in BaFe2As2 (122) based iron-arsenide superconductors. We find ordered 122 atomic arrangements within the ab-plane, ... More

Nanoscale Interlayer Defects in Iron ArsenidesJun 26 2019Jul 10 2019Using a local real-space microscopy probe, we discover evidence of nanoscale interlayer defects along the c-crystallographic direction in BaFe2As2 (122) based iron-arsenide superconductors. We find ordered 122 atomic arrangements within the ab-plane, ... More

Electron cooling with graphene-insulator-superconductor tunnel junctions and applications to fast bolometryJun 26 2019Electronic cooling in hybrid normal metal-insulator-superconductor junctions is a promising technology for the manipulation of thermal loads in solid state nanosystems. One of the main bottlenecks for efficient electronic cooling is the electron-phonon ... More

Intriguing electronic and optical prospects of FCC bimetallic heterostructures: large area interface versus embedded and doped nanostructuresJun 26 2019Room temperature superconductivity and large-area epsilon-near-zero interfaces are long-standing goals of Condensed Matter Physics and Optics. Motivated by the recent advancements of experimental scenario of metallic nanostructures, we have theoretically ... More

Smart metastructure method for increasing TC of Bi(Pb)SrCaCuO high-temperature superconductorsJun 26 2019Improving the critical transition temperature (TC) of Bi(Pb)SrCaCuO (B(P)SCCO) high-temperature superconductors is important, however, considerable challenges exist. In this study, we designed a smart meta-superconductor B(P)SCCO consisting of B(P)SCCO ... More

Doping-induced superconductivity in the van der Waals superatomic crystal Re$_6$Se$_8$Cl$_2$Jun 25 2019Superatomic crystals are composed of discrete modular clusters that emulate the role of atoms in traditional atomic solids$^{1-4}$. Owing to their unique hierarchical structures, these materials are promising candidates to host exotic phenomena, such ... More

Antiunitary symmetry protected higher order topological phasesJun 25 2019Higher order topological (HOT) phases feature boundary (such as corner and hinge) modes of codimension $d_c>1$. We here identify an antiunitary operator that ensures the spectral symmetry of a two-dimensional HOT insulator and existence of cornered localized ... More

Dispersive sensing in hybrid InAs/Al nanowiresJun 25 2019Dispersive charge sensing is realized in hybrid semiconductor-superconductor nanowires in gate-defined single- and double-island device geometries. Signal-to-noise ratios (SNRs) were measured both in the frequency and time domain. Frequency-domain measurements ... More

Competing Electronic Phases near the Onset of Superconductivity in Hole-doped SrFe2As2Jun 25 2019An intriguingly complex phase diagram of Na-doped SrFe2As2 is uncovered using high-resolution thermal-expansion, magnetization and heat-capacity measurements. The detailed temperature dependence of the orthorhombic distortion and the anisotropy of the ... More

Pressure induced Superconductivity and location of Fermi energy at Dirac point in BiSbTe3Jun 25 2019We have grown single-crystal BiSbTe3 3D TI sample and studied structural, TE as well as pressure dependent magneto-transport properties. Large positive Seebeck coefficient confirmed the p-type nature of BiSbTe3, which is consistent with Hall measurement. ... More

Direct-Write Ion Beam Irradiated Josephson JunctionsJun 25 2019We highlight the reproducibility and level of control over the electrical properties of YBa$_2$Cu$_3$O$_7$ Josephson junctions fabricated with irradiation from a focused helium ion beam. Specifically, we show the results of electrical transport properties ... More