Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session S61: Superconductivity: Thermodynamic, Transport, ElectronicRecordings Available

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Sponsoring Units: DCMP Chair: Hyowon Park, University of Illinois Chicago Room: Hyatt Regency Hotel Field 
Thursday, March 17, 2022 8:00AM  8:12AM 
S61.00001: Thermal Transport in 2D Nematic Superconductors Sourav S Choudhury, Sean Peterson, Yves U Idzerda Thermal conductivity measurements are a very useful probe of superconductivity as it can reveal the gap structure of unconventional superconductors. Here we study thermal transport in a twodimensional system with coexisting Superconducting (SC) and Nematic orders. We treat both the superconducting and nematic orders within the mean field approximation. A dwave Pomeranchuk instability was used to model the nematic state and the feedback of the symmetrybroken nematic state on the SC channel was modeled through the mixing of s and dwave components. The electronic thermal conductivity was calculated within the framework of Boltzmann kinetic theory, for both the Born and Unitary limits. We describe the influence of the Fermi surface (FS) topology, the competition/cooperation between the SC and Nematic order parameters, the effect of the nematic feedback on the SC order, on the low temperature behaviour of thermal conductivity. Numerical results obtained point to novel heat transport signatures of nematic superconductors. This work was supported by the National Science Foundation under grants DMR1906383 and DMR1809846. 
Thursday, March 17, 2022 8:12AM  8:24AM 
S61.00002: The universal characteristics and possible origin of quadrature magnetoresistance Roemer Hinlopen, Stijn Hinlopen, Jake Ayres, Maarten Berben, Nigel E Hussey Recently, quadratictolinear magnetoresistance (MR) as a function of magnetic field has emerged as a pervasive phenomenon among strange and quantum critical metals. Examples are the antiferromagnetic quantum critical metal BaFe2(As,P)2 (1), heavy fermion (Yb,La)Rh2Si2 (2) and optimally and overdoped cuprates (Nd)LSCO (3,4), Tl2201 and Bi2201 (5) as well as electron doped LCCO (6). Given the variety of Fermi surface topologies, dominant interactions and energy scales in these systems, the striking similarity of their magneticfield response suggests some universal, but as yet unidentified, organizing principle. Here, we critically review the existing literature to establish the universal characteristics defining the phenomenology. We establish distinct features which escape conventional theory as well as single parameter scaling. Second, we propose a new, simple theory based on impeded cyclotron motion which captures not only the quadrature form, but also the universality with which it is observed. 
Thursday, March 17, 2022 8:24AM  8:36AM 
S61.00003: Mechanisms of PhaseSlip Magnetoresistance in Superconducting Quantum Wires Juhun Kwak, Emil Pellett, Alex Levchenko Superconductivity in quantum wires is prone to phaseslip fluctuation processes that result in the resistive tails below the nominal transition temperature Tc. In the immediate proximity to Tc phaseslips are predominantly thermallyactivated and can be described by LangerAmbegaokarMcCumberHalperin (LAMH) model derived on the basis of the timedependent GinzburgLandau (GL) theory. In this work, we discuss mechanisms of phaseslip resistance in magnetic field ranging from the depairing effects to modification of the energy cost of LAMH instanton and quantum fluctuations that cannot be captured with the GL theory. Particular attention is devoted to phaseslips in proximitized semiconductor wires where effects of spinorbit coupling lead to additional mechanisms of magnetoresistance. 
Thursday, March 17, 2022 8:36AM  8:48AM 
S61.00004: Thermodynamic Potentials of Crystalline Soliton Superconducting Condensates Emil Pellett, Juhun Kwak, Maxim Dzero, Alex Levchenko In many practical cases thermodynamic laws dictate that superconductivity must occur in the form of a spatially inhomogeneous state which brings about spatial modulation of the order parameter. Profound examples of this behavior are given by the Abrikosov vortex lattice state and the FuldeFerrellLarkinOvchinnikov helical complex condensate. More generally, selfconsistent Bogoliubovde Gennes (BdG) equations of superconductivity are known to admit exact solutions in the form of spatial solitons. With a carefully chosen ansatz, we use an exact mapping from the BdG Hamiltonian to the integrable nonlinear Schrodinger equation and employ complimentary tools from the inverse scattering approach to construct crystalline soliton condensate solutions. We derive their spectral properties and analyze their energetic costs by computing their corresponding grand potentials. Examples from inhomogeneous quasi1D superconductivity and systems with a spindensitywave will be presented. 
Thursday, March 17, 2022 8:48AM  9:00AM 
S61.00005: Semiclassical theory of wavepacket dynamics for quasiparticles in spinorbit coupled superconductors Michael Smith, YiTing Hsu Spinorbit coupling is a crucial ingredient for achieving topological superconductivity with or without the proximity effect. This is because the broken spin degeneracy on the Fermi surface can lead to effective spintriplet Cooper pairs. However, recently there has been a marked interest in systems with strong spinorbit coupling and intrinsic superconductivity, such as transition metal dichalcogenide NbSe_{2}, which is an Ising superconductor. Here we present a semiclassical theory of wavepacket dynamics for quasiparticles in 2D superconductors with strong spinorbit coupling. We focus on superconductors with Rashba or Ising spinorbit coupling and study the spectroscopic and transport properties of quasiparticles. Finally, we discuss possible experimental signatures in promising platforms for topological superconductivity, such as a proximitized 3D topological insulator and monolayer transition metal dichalcogenides. 
Thursday, March 17, 2022 9:00AM  9:12AM 
S61.00006: Nanoscale functionalized superconducting transport channels as photon detectors Catalin D Spataru, Francois Leonard Singlephoton detectors have typically consisted of macroscopic materials where both the photon absorption and transduction to an electrical signal happen. Newly proposed designs suggest that large array nanoscale detectors could provide improved performance in addition to decoupling the absorption and transduction processes. Here we study the properties of such a detector consisting of a nanoscale superconducting (SC) transport channel functionalized by a photon absorber. We explore two detection mechanisms based on photoinduced electrostatic gating and magnetic effects. We model the narrow channel as a onedimensional atomic chain and use a selfconsistent KeldyshNambu Green's function formalism to describe nonequilibrium effects and SC phenomena. We consider cases where the photon creates electrostatic and magnetic changes in the absorber, as well as devices with strong and weak coupling to the metal leads. 
Thursday, March 17, 2022 9:12AM  9:24AM 
S61.00007: heat transport of the 2D singleband Hubbard model Wen O Wang, Jixun K Ding, Brian Moritz, Yoni Schattner, Edwin Huang, Thomas P Devereaux We investigate the thermal conductivity and specific heat of the 2D Hubbard model using the numerically exact determinant quantum Monte Carlo algorithm and maximum entropy analytic continuation. At half filling, both specific heat and thermal conductivity show peaks at temperature scales related to the Hubbard interaction energy U and spin superexchange energy J. We identify two kinds of contributions to the specific heat and the thermal conductivity: one which involves the local kinetic energy and another which involves the interaction term. At low temperatures, where the charge degrees of freedom are gappedout, the contribution to both specific heat and the thermal Drude weight associated with the kinetic energy agree well with spinwave theory for the spin1/2 antiferromagnetic Heisenberg model. In the metallic phase, we describe the evolution of the thermal conductivity with temperature and doping and contrast it with the electrical conductivity and the specific heat. 
Thursday, March 17, 2022 9:24AM  9:36AM Withdrawn 
S61.00008: Thermal Hall effect in undoped cuprates Sijia Zhao, Thomas P Devereaux Recent experiments on thermal Hall conductivity in undoped cuprates observed an unexpectedly large result. Several mechanisms of phonon Hall effect have been proposed to explain this phenomenon. Here by using the Kubo formula with the energy magnetization included we show that a magnetic field acting on phonons in undoped cuprates naturally gives a nonzero intrinsic thermal Hall effect. Temperaturedependent thermal Hall conductivity κ_{H} is estimated by using phonon dispersions and the Berry connections of both the phonon bands and the electrons, which will be discussed in a model of LCO. The magneticfield dependence of κ_{H} will also be shown in the same model. 
Thursday, March 17, 2022 9:36AM  9:48AM 
S61.00009: Electron cooling by phonons in phasebiased superconducting proximity systems Danilo Nikolic, Wolfgang Belzig We investigate the electronphonon cooling power in disordered electronic systems with a special focus on mesoscopic superconducting proximity structures. Employing the quasiclassical Keldysh Green's function method, we obtain a general expression for the cooling power perturbative in the electronphonon coupling, but valid for arbitrary electronic systems out of equilibrium. This very general formalism we apply to the case of a disordered superconductornormalmetalsuperconductor proximity structure in equilibrium observing a significantly suppressed cooling power at low temperatures. This effect is related to the existence of a minigap in the quasiparticle spectrum. Furthermore, the minigap is directly controlled by the superconducting phase difference across the junction providing a high tunability of the effect. This makes such structures highly promising candidates for quantum calorimetry. 
Thursday, March 17, 2022 9:48AM  10:00AM 
S61.00010: Systematic electronic structure in the cuprate parent state from quantum manybody simulations ZhiHao Cui, Huanchen Zhai, Xing Zhang, Garnet Chan The quantitative description of correlated electron materials remains a modern computational challenge. We demonstrate a numerical strategy to simulate correlated materials at the fully ab initio level beyond the solution of effective lowenergy models, and apply it to gain a detailed microscopic understanding across a family of cuprate superconducting materials in their parent undoped states. We uncover microscopic trends in the electron correlations and reveal the link between the material composition and magnetic energy scales via a manybody picture of excitation processes involving the buffer layers. Our work illustrates a path towards the quantitative and reliable understanding of more complex states of correlated materials at the ab initio manybody level. 
Thursday, March 17, 2022 10:00AM  10:12AM 
S61.00011: Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV_{3}Sb_{5} Min Gu Kang, Shiang Fang, JeongKyu Kim, Brenden Ortiz, SaeHee Ryu, Jimin Kim, Jonggyu Yoo, Giorgio Sangiovanni, Domenico Di Sante, ByeongGyu Park, Christopher Jozwiak, Aaron Bostwick, Eli Rotenberg, Efthimios Kaxiras, Stephen D Wilson, JaeHoon Park, Riccardo Comin The layered vanadium antimonides AV_{3}Sb_{5} (A = K, Rb, Cs) are a recently discovered family of topological kagome metals that exhibit a range of strongly correlated electronic phases including charge order and superconductivity. However, it is not yet understood how the singularities inherent to the kagome electronic structure are linked to the observed manybody phases. Here, we combine angleresolved photoemission spectroscopy and density functional theory to reveal multiple kagomederived van Hove singularities (vHS) coexisting near the Fermi level of CsV_{3}Sb_{5} and analyze their contribution to electronic symmetry breaking. The vHS in CsV_{3}Sb_{5} are characterized by two distinct sublattice flavors – pure (p)type and mixed (m)type – which critically determines the pairing symmetry and ground states emerging in AV_{3}Sb_{5} series. We establish that, among the multiple vHS in CsV_{3}Sb_{5}, the mtype vHS of the d_{xz}/d_{yz} kagome band and the ptype vHS of the d_{xy}/d_{x2y2} kagome band cross the Fermi level to allow electronic symmetry breaking. The former band exhibits pronounced Fermi surface nesting, while the latter contributes via higherorder vHS. Our work reveals the essential role of kagomederived vHS for the collective phenomena realized in the AV_{3}Sb_{5} family. 
Thursday, March 17, 2022 10:12AM  10:24AM 
S61.00012: Superconductivity and Antiferromagnetism in NdNiO2 and CaCuO2: a cluster DMFT study Jonathan Karp, Alexander Hampel, Andrew J Millis We perform a comparative 2x2 real space cluster dynamical mean field theory (DMFT) study on minimal models (obtained by downfolding DFT band calculations) for NdNiO2 and CaCuO2 using a Nambu formalism that allows for both superconducting and antiferromagnetic order. We produce a phase diagram in temperature and doping. The effect of the spectator bands characteristic of the nickelate material is determined. The models have some similarities, including antiferromagnetic states and a superconducting dome that emerges upon hole doping with a small coexistence region, and some differences, including a doping shift due to spectator bands and additional quantitative differences relating to the differences in interaction strengths. A comparison to the experimental phase diagrams is presented. The implications of the predicted wide region of antiferromagnetism are discussed. 
Thursday, March 17, 2022 10:24AM  10:36AM 
S61.00013: Distinguishing finite momentum superconducting pairing states with twoelectron photoemission spectroscopy Fahad Mahmood, Thomas P Devereaux, Peter Abbamonte, Dirk K Morr We show theoretically that double photoemission (2eARPES) may be used to identify the pairing state in superconductors in which the Cooper pairs have a nonzero centerofmass momentum, q_{cm}. We theoretically evaluate the 2eARPES counting rate, P^{(2)}, for the cases of a d_{x2−y2} wave superconductor, a pairdensitywave (PDW) phase, and a FuldeFerrelLarkinOvchinnikov (FFLO) phase. We show that P^{(2)} provides direct insight into the centerofmass momentum and spin state of the superconducting condensate, and thus can distinguish between these three different superconducting pairing states. In addition, P^{(2)} can be used to map out the momentum dependence of the superconducting order parameter. Our results identify 2eARPES as an ideal tool for identifying and probing q_{cm }≠ 0 superconducting pairing states in superconductors. 
Thursday, March 17, 2022 10:36AM  10:48AM 
S61.00014: Mott transition and electronic excitation from a Fermiliquidlike ground state Masanori Kohno If the ground state is like a Fermi liquid, it is widely believed that the Mott transition is characterized by the divergence of the effective mass; the dispersion relation of electronic excitation around the Fermi level becomes flat toward the Mott transition. Here, even if the ground state is assumed to be a Fermiliquidlike state (Gutzwiller wavefunction), the Mott transition is shown to be better characterized by the disappearance of spectral weight from an electronaddition mode which remains dispersing and exhibits the momentumshifted magnetic dispersion relation in the small holedoping limit [1]. This characteristic is illustrated in the onedimensional, twodimensional, ladder, and bilayer tJ models using a Monte Carlo method and the singlemode approximation [1]. In addition, this characteristic is confirmed in the onedimensional symmetric tJ model with inversesquared interaction, whose ground state is known to be the Gutzwiller wavefunction. The results imply that this characteristic is not so sensitive to groundstate properties and generally appears in the Mott transition [13]. References: [1] M. Kohno, Phys. Rev. B 102, 165141 (2020). [2] M. Kohno, Rep. Prog. Phys. 81, 042501 (2018). [3] M. Kohno, Phys. Rev. B 92, 085129 (2015). 
Thursday, March 17, 2022 10:48AM  11:00AM 
S61.00015: Dissipative States Induced by Current Pulse in NbTi Superconducting Filaments Khalil Harrabi

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