Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session D22: Superconductivity: Competing Phases-I |
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Sponsoring Units: DCMP Chair: Sumitendra Mazumdar, University of Arizona Room: Room 214 |
Monday, March 6, 2023 3:00PM - 3:12PM |
D22.00001: Kramer’s degenerate magnetism and superconductivity: Part I: General Theory Adil Amin, Hao Wu, Daniel F Agterberg The interplay of superconductivity with translation invariant - Kramer’s degenerate-magnetic states, such as loop currents or odd-parity multipole magnetic order is examined. This work is motivated by the recent likely observation of the coexistence between an odd-parity multipole magnetic state and superconductivity in CeRh2As2 as well as studies of the interplay of loop currents with superconductivity in the cuprates. We show that the presence of such magnetic states generically suppress superconductivity, whether it be spin-singlet or spin-triplet. The superconducting states also often give rise to Bogoliubov Fermi surfaces. Despite the general suppression of superconductivity, we show that superconductivity can survive in two cases: a) by inducing finite momentum pairing states b) or under suitable symmetry conditions. |
Monday, March 6, 2023 3:12PM - 3:24PM |
D22.00002: Kramer’s degenerate magnetism and superconductivity: Part II: Applications Hao Wu, Adil Amin, Daniel F Agterberg We apply the general formalism of Kramer’s degenerate magnetism and superconductivity to two specific realizations: loop current order in the Cuprates and CeRh2As2. We show that loop current order suppresses uniform superconductivity. However, we further show that the system is unstable towards a finite momentum pairing state which restores superconductivity. Numerically we find this finite momentum state tends to strongly reduce the Bogoliubov Fermi surfaces. We contrast this to CeRh2As2, where we show that only a uniform superconducting state exists, and we argue that superconductivity persists due to the non-symmorphic crystal structure. |
Monday, March 6, 2023 3:24PM - 3:36PM |
D22.00003: Application of Quantum Cluster Methods with a dynamical Hartree-Fock approximation to the extended Hubbard model Sarbajaya Kundu, David Sénéchal The single-band Hubbard model has been studied extensively as the prototype of physical models for strongly correlated systems. Adding extended interactions to this model can be useful for considering more realistic long-range Coulomb interactions, as well as lattice-induced attractive interactions. While this model is also well-studied, previous studies on this model have often used perturbative approaches, or focused on the half-filled limit. In this talk, I will discuss the results of our recent analysis of the square lattice extended Hubbard model, both for attractive and repulsive extended interactions, using a combination of Cluster Dynamical Mean Field theory (CDMFT), which treats the Hubbard interaction U non-perturbatively, and a Hartree-Fock mean-field decoupling of the intercluster extended interaction V, in both superconducting and particle-hole channels. We study the phase diagram of this model as a function of the filling, and examine its dependence on the couplings U and V. For attractive V, our analysis confirms d-wave superconductivity near half-filling, giving way to extended s-wave pairing as a function of doping, via a mixed s+id state. At half-filling, we study the competition of the antiferromagnetic state with superconductivity for attractive V, and charge-density wave order for repulsive V. Finally, we do not find any significant evidence of p-wave superconductivity in this model, within the parameter regimes considered by us. |
Monday, March 6, 2023 3:36PM - 3:48PM Author not Attending |
D22.00004: Superconductivity and stripes of strongly-correlated electrons in a magnetic field Niccolo Baldelli, Matthew Fishman, Alexander Wietek We study the t-t’ Hubbard model in a region of the phase diagram expected to show a coexistence between a charge density wave (CDW) and d-wave superconductivity (SC), expanding on previous results for the approximate t-t’-J model. We obtain the ground state for a width four cylinder using DMRG and rely on the Penrose-Onsager criterion for the condensation of Cooper pairs to identify the SC+CDW phase. In this way we are able to obtain results using a much lower bond dimension compared to previous studies. We discuss the possible extension of the results in a presence of a background magnetic field, in particular the creation of extended polarons bounded by vortices and the presence of topological signatures. |
Monday, March 6, 2023 3:48PM - 4:00PM |
D22.00005: Linear Response Approach to Superconducting Phase Transition Temperature Xiansheng Cai, Pengcheng Hou, Tao Wang, Youjin Deng, Nikolay Prokof'ev, Boris Svistunov, Kun Chen Superconductivity from repulsive interaction has been extensively studied theoretically and experimentally, but determining critical temperature Tc remains challenging due to the exponential smallness of Tc. We propose a novel approach to detect and quantify Cooper instability by monitoring the divergence of the linear response to a symmetry breaking perturbation, and demonstrate that this approach allows an accurate prediction of Tc from known system properties at T»Tc. We establish the phase diagram of the three dimensional(3D) and two dimensional(2D) uniform electron gas(UEG) in the dense limit where the random phase approximation(RPA) is controlled, including quantum critical points for various symmetry channels as the value of rs is decreased. |
Monday, March 6, 2023 4:00PM - 4:12PM |
D22.00006: Superconductivity in the Triangular-Lattice t-J Model of Twisted Bilayer Transition Metal Dichalcogenide Feng Chen, Donna Sheng Recent experimental progress has established the twisted bilayer transition metal dichalcogenide (TMD) as a highly tunable platform for studying many-body physics. Particularly, the homobilayer TMD is believed to be a quantum simulator of a generalized triangular-lattice Hubbard model with a spin-dependent hopping phase θ that is induced by a displacement field. To explore the effects of θ on the system state, we perform density matrix renormalization group calculation of the relevant triangular lattice t-J model on a four-leg cylinder. By changing θ for lightly doped systems, we identify different quantum phases: a stripe charge density wave phase (CDW), a superconducting phase without charge stripes (SC) and a |
Monday, March 6, 2023 4:12PM - 4:24PM |
D22.00007: Competing orders in a bilayer Hubbard model Fangze Liu, Cheng Peng, Edwin W Huang, Chunjing Jia, Brian Moritz, Thomas Devereaux Hybridization between local orbitals and itinerant electrons is substantial in many strongly correlated materials. We study a model of itinerant electrons hybridized with a strongly interacted Hubbard layer by using numerically exact determinant quantum Monte Carlo (DQMC) simulations. In a specific range of interlayer hopping, we observe that the pairing vertex associated with PDW order becomes more attractive than that for uniform d-wave pairing when both layers are nearly half-filled. On the other hand, when the Hubbard layer is hole doped and the non-interacting layer is almost empty, we show that both layers develop antiferromagnetism, instead of spin stripes, in a similar range of interlayer hopping. |
Monday, March 6, 2023 4:24PM - 4:36PM |
D22.00008: Competition of density waves and superconductivity in moiré transition metal dichalcogenide bilayers from functional renormalization Michael Scherer, Laura Classen, Dante M Kennes, Nico Gneist Experimental demonstrations of tunable correlation effects in magic-angle twisted bilayer graphene have put two-dimensional moiré quantum materials at the forefront of condensed-matter research. Bilayers of transition metal dichalcogenides (TMDs) have further enriched the opportunities for analysis and utilization of correlations in such systems. Recently, within the latter material class, the relevance of many-body interactions with an extended range has been demonstrated. Moiré bilayer TMDs can be accurately modelled by effective extended Hubbard models on the triangular superlattice, which define a starting point for quantum many-body approaches. In my talk, I will present a functional renormalization group approach for correlated fermion systems as a suitable quantum many-body method to describe competing Fermi surface instabilities and resulting correlated phases of moiré TMD bilayers. The concrete examples will be MoS2/WSe2 and twisted bilayer WSe2. The results from this approach suggest that bilayer TMDs are unique platforms to realize topological superconductivity with high winding number which reflects in pronounced experimental signatures such as enhanced quantum Hall features and pair-density-wave superconductors. |
Monday, March 6, 2023 4:36PM - 4:48PM |
D22.00009: How strong the electron-phonon interaction in metals can be? Emil Yuzbashyan, Boris L Altshuler I’ll show that the dimensionless electron-phonon coupling λ cannot exceed a certain critical value in metals. Increasing λ beyond this value leads to a structural instability accompanied by a metal-insulator transition. This also implies an upper bound on the superconducting Tc in units of the characteristic phonon frequency in conventional superconductors. We’ll compare the upper bounds on λ and Tc with existing experimental data. |
Monday, March 6, 2023 4:48PM - 5:00PM |
D22.00010: Systematic study of intertwined orders in the three-band Hubbard model Rong Zhang, Sijia Zhao, Wen O Wang, Jixun K Ding, Tianyi Liu, Edwin W Huang, Brian Moritz, Thomas Devereaux The three-band Hubbard model (also known as the Emery model) captures much of the physics of the copper oxide plane of cuprate high-temperature superconductors. We report a numerically exact determinant quantum Monte Carlo study of the three-band Hubbard model for various doping levels on square clusters and four-leg cylinders, focusing on the superconducting pair-field susceptibility, as well as the spin and charge correlation functions. The pair-field susceptibility indicates that d-wave pairing of holes on copper is dominant over an extended s-wave pairing of holes on oxygen and other copper-oxygen pairing channels. Our results shed light on the role of oxygen in multiple intertwined orders of the multi-orbital Hubbard model. |
Monday, March 6, 2023 5:00PM - 5:12PM |
D22.00011: Current driven motion of magnetic topological defect in ferromagnetic superconductor Suk Bum Chung, Se Kwon Kim Recent years have seen a number of instances where magnetism and superconductivity intrinsically coexist. Our focus is on the case where spin-triplet superconductivity arises out of ferromagnetism, and we make a hydrodynamic analysis of the effect of charge supercurrent on magnetic topological defects like domain walls and merons. We find that while the energy dissipation is broadly similar to that of the normal state in arising solely out of Gilbert damping, other physical quantities such as the local energy flux density and the interaction between defects is qualitatively modified in the superconducting phase, by the emergent electromagnetic field that arises out of the superconducting order parameter. |
Monday, March 6, 2023 5:12PM - 5:24PM |
D22.00012: Fluctuating Ru trimer precursor to a two-stage electronic transition in RuP Emil S Bozin, Robert Koch, Niraj Aryal, Oleh Ivashko, Yu Liu, Milinda Abeykoon, Eric D Bauer, Martin von Zimmermann, Weiguo Yin, Cedomir Petrovic Superconductivity in binary ruthenium pnictides occurs proximal to and upon suppression of a mysterious non-magnetic ground state, preceded by a pseudogap phase associated with Fermi surface instability, and its critical temperature, Tc, is maximized around the pseudogap quantum critical point. By analogy with well-studied isoelectronic iron-based counterparts, antiferromagnetic fluctuations became "usual suspects" as putative mediators of superconducting pairing. Here we report on a high temperature local symmetry breaking in RuP, the parent of the maximum-Tc branch of these novel superconductors, revealed by combined nanostructure-sensitive powder and single crystal X-ray total scattering experiments. Large local Ru6 hexamer distortions associated with orbital-charge trimerization form above the two-stage electronic transition in RuP. While hexamer ordering enables the nonmagnetic ground state and presumed complex oligomerization, the relevance of pseudogap fluctuations for superconductivity emerges as a distinct prospect. As a transition metal system in which partial d-manifold filling combined with high crystal symmetry promotes electronic instabilities, this represents a further example of local electronic precursors underpinning the macroscopic collective behavior of quantum materials [1]. |
Monday, March 6, 2023 5:24PM - 5:36PM |
D22.00013: Exploring the interplay between superconductivity and charge-density-wave in (Sr1-xCax)3Rh4Sn13 Fellipe B Carneiro, Priscila Rosa, Sean Thomas, Clement Girod, Eduardo M Bittar Charge-density-waves (CDW) and their relation to superconductivity and quantum criticality have attracted the attention of the condensed matter physics community in recent years. In high-temperature superconductors, the interplay between the CDW and superconducting states is a subject of debate [1,2]. In intermetallic compounds such as R3M4Sn13 (R = Sr, Ca and M = Rh, Ir), the CDW can be suppressed by a non-thermal control parameter, which enhances the superconductivity and leads to a quantum critical point (QCP) where the CDW transition temperature (TCDW) vanishes [3,4]. However, whether the nature of the relation between CDW and SC states in these materials is of coexistence or competition is still a matter of debate. In this work, we aim to explore this interplay through low-temperature single-crystal synchrotron X-ray diffraction, thermal expansion, and electrical transport measurements under uniaxial stress. |
Monday, March 6, 2023 5:36PM - 5:48PM |
D22.00014: Isotope Effect on Superconductivity in Solid Hydrogen Mehmet Dogan, James R Chelikowsky, Marvin L Cohen After decades of experimental progress on diamond anvil cells, researchers are able to squeeze solid hydrogen to pressures up to 450 GPa. In particular, two recent experiments by Loubeyre et al. employed infrared measurements to track the direct band gap and vibron frequency of hydrogen up to ~425 GPa [1] and deuterium up to ~460 GPa [2]. We previously argued that observed data is consistent with the molecular C2/c-24 phase, which can explain the observed behavior up to ~425 GPa and above without requiring a structural phase transition [3]. The observations on deuterium strengthen our interpretation. We also previously reported the predicted superconducting properties of this phase as well as the other three most likely phases (Cmca-12, Cmca-4 and I41/amd-2) in the 400–500 GPa range [4,5]. In this work, we employ a Wannier function-based dense k-point and q-point sampling to compute the electron-phonon coupling and superconducting properties of solid deuterium in these four phases. In addition to their predictive nature, our findings will help future experiments distinguish between the candidate crystal phases. |
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