Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session S64: Novel Quantum Fluids and SolidsRecordings Available
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Sponsoring Units: DCMP Chair: Han Yan, Rice University Room: Hyatt Regency Hotel -Grant Park B |
Thursday, March 17, 2022 8:00AM - 8:12AM |
S64.00001: Fermi Liquid Interactions and Properties of 2D Fermi Systems: A Crossing-Symmetric Approach Nicholas Corkill, Thomas L Ainsworth, Gabriel Kotliar, Khandker F Quader We develop a crossing-symmetric model for microscopically obtaining Fermi liquid interactions in 2D Fermi systems. Partial re-summation of Feynman diagrams, renormalization of quasiparticle interactions, and the preservation of crossing symmetry leads to coupled, nonlinear integral equations in terms of momentum-dependent Fermi liquid interactions and scattering amplitudes [Ref. 1,2]. Expansion of 2D quasiparticle interactions in terms of Chebyshev polynomials leads to a set of coupled equations that are solved self-consistently using an iterative method. The underlying repulsive or attractive interactions serve as the driving terms. We calculate several physical properties and, in particular, find the 2D system to be robust against ferromagnetic and density instabilities even for sizeable interaction strengths. We also explore pairing properties of the system. |
Thursday, March 17, 2022 8:12AM - 8:24AM |
S64.00002: Spin-orbit coupling and P-wave pairing in neutron matter Jiawei Wang, Eckhard Krotscheck, Panagiota Papakonstanitnou The interior of neutron star contains matter in its most extreme form occurring in nature. In 1975, Anderson and Itoh[1] proposed to explain the glitches of pulsar signals, firstly observed in 1969, by pinning and unpinning of vortices in a nuclear superfluid inside the star. Since then, the study of neutron matter, a form of matter made from nucleons and assumed to be inside neutron star, have provided fruitful development of many-body theory. |
Thursday, March 17, 2022 8:24AM - 8:36AM |
S64.00003: The Higgs condensate is a symmetry-protected topological phase Ruben Verresen, Umberto Borla, Sergej Moroz, Ashvin Vishwanath, Ryan Thorngren Gauge theories are ubiquitous even outside the standard model, arising as effective low-energy descriptions of many-body quantum systems. The Higgs phase arises upon condensing the gauge charges of such a theory. The physical nature of the Higgs phase is sometimes a source of conceptual confusion---its apparent description as a symmetry-breaking phase of matter is in conflict with the unbreakable nature of a gauge symmetry. In this talk, we point out that the Higgs phase can be naturally interpreted as a symmetry-protected topological (SPT) phase when the condensate carries charge under a global symmetry. This condition arises naturally in emergent gauge theories where the Gauss law is energetically enforced. We illustrate this for the toric code model coupled to matter, where we identify the SPT edge mode of the Higgs phase. We also discuss the physical implications for superconductors---the Higgs phase associated to electromagnetism. |
Thursday, March 17, 2022 8:36AM - 8:48AM |
S64.00004: Axial-Current Anomaly in Euler Fluid Pavel Wiegmann, Alexandre G Abanov We argue that a close analog of the axial-current anomaly of quantum field theories with fermions occurs in the classical Euler fluid. The conservation of the axial current (closely related to the helicity of inviscid barotropic flow) is anomalously broken by the external electromagnetic field as $\p_\mu j_{A}^\mu = 2\,\bm E\!\cdot\! \bm B$ similar to that of the axial current of a quantum field theory with Dirac fermions such as QED. |
Thursday, March 17, 2022 8:48AM - 9:00AM |
S64.00005: The interacting insulator in 1D via DMRG Josephine Yu, Srinivas Raghu, Hong-Chen Jiang A system of non-interacting electrons with strong quenched randomness is an Anderson insulator. Interactions in such insulators are known to enhance local moment formation, which in turn alters the nature of the ground state from the Anderson picture and may ultimately play a role in phase transitions involving the insulating state. The problem remains poorly studied in part due to the lack of tools available to study a strongly disordered, interacting system of electrons. We employ density matrix renormalization group (DMRG) simulations to study the effect of interactions on one-dimensional Anderson insulators. We analyze spin and charge correlations of the Hubbard model with intermediate interaction strength, in the presence of site and bond randomness, and contrast the resulting behaviors with those of an Anderson insulator. |
Thursday, March 17, 2022 9:00AM - 9:12AM |
S64.00006: Viscometry of electron fluids from symmetry Caleb Q Cook When electrons flow as a viscous fluid in anisotropic metals, the reduced symmetry can lead to exotic viscosity tensors with many additional, non-standard components. I will present a novel viscometry technique that can in principle measure the multiple dissipative viscosities allowed in isotropic and anisotropic fluids alike. By applying representation theory to exploit the intrinsic symmetry of the fluid, this viscometry is also exceptionally robust to both boundary complications and ballistic effects. I will present the technique via the illustrative example of dihedral symmetry, relevant in this context as the point symmetry of 2D crystals. Finally, in outline the technqiue, I will also propose a present-day realizable experiment for detecting, in a metal, a novel hydrodynamic phenomenon: the presence of rotational dissipation in an otherwise-isotropic fluid. |
Thursday, March 17, 2022 9:12AM - 9:24AM |
S64.00007: Non-Abelian fracton order from gauging a mixture of subsystem and global symmetries Yi-Ting Tu, Po-Yao Chang We construct a one-step gauging procedure of a pure matter theory on a lattice with a nontrivial mixture of subsystem and global symmetries. Gauging such mixed symmetries can produce non-Abelian fracton orders, which contain immobile excitations with nontrivial fusion rules. Furthermore, by constraining the local Hilbert space, the algebra of charge and flux operators can be identified with a subalgebra of the quantum double models, so that we can classify the species of fractons, lineons, etc., from the gauge group. In particular, if the resulting algebra depends on the constraint, it leads to the fusion of excitations of one geometry into that of another geometry (e.g. loops into lineons) in the Abelian case. |
Thursday, March 17, 2022 9:24AM - 9:36AM |
S64.00008: Hydrodynamics with exotic charges and currents: multipole conservation, higher form symmetry, and beyond Marvin Qi, Andrew Lucas We explore the landscape of possible hydrodynamic universality classes that can arise out of: conserved quantities that transform non-trivially under spatial point group symmetries, currentsin non-standard representations of the point group, and/or higher-deriative generalizations of thecharge conservation Ward identity. Our framework links together numerous existing theories, including magnetohydrodynamics and fracton hydrodynamics; moreover, it can easily be extended to generate infinite families of new universality classes. As an application, we introduce a new class of hydrodynamics exhibiting almost-conserved quantities and dangerously irrelevant operators and fluctuations; as another, we derive the analogue of magnetohydrodynamics for higher rank gauge fields. |
Thursday, March 17, 2022 9:36AM - 9:48AM |
S64.00009: Breakdown of Hydrodynamics Below Four Dimensions in a Fracton Fluid Paolo Glorioso We present the nonlinear fluctuating hydrodynamics which governs the late time dynamics of a chaotic many-body system with simultaneous charge/mass, dipole/center of mass, and momentum conservation. This hydrodynamic effective theory is unstable below four spatial dimensions: dipole-conserving fluids at rest become unstable to fluctuations, and are governed not by hydrodynamics, but by a fractonic generalization of the Kardar-Parisi-Zhang universality class. Numerical simulations of one-dimensional models with dipole and momentum conservation confirm our predictions, showing evidence for a breakdown of hydrodynamics, along with a new universality class of undriven yet non-equilbrium dynamics. |
Thursday, March 17, 2022 9:48AM - 10:00AM |
S64.00010: Electronic spectra of the pseudogap metal in the ancilla theory of the single band Hubbard model. Alexander Nikolaenko, Maria Tikhanovskaya, Eric Mascot, Yahui Zhang, Dirk K Morr, Subir Sachdev The diverse phenomena associated with high-temperature superconductivity in the cuprates present a long-standing theoretical challenge. Various emerging phases have been thoroughly studied experimentally, including angle-resolved photoemission (ARPES), scanning tunnelling microscopy (STM), transport and thermodynamic measurements, but a complete theoretical understanding is still lacking. Many theoretical models have been proposed to describe the pseudogap regime of the cuprate superconductors. Some of them assume that the pseudogap is a precursor to some ordered phase, such as a spin density wave (SDW), or a charge density wave (CDW), or a pair density wave (PDW). A different class of models assume that the pseudogap is a distinct phase of matter characterized by spin liquid physics, which likely undergoes a confinement crossover to a more conventional broken symmetry phase at low temperatures. Here, we will investigate a model in the latter class, which describes the pseudogap metal as a fractionalized Fermi liquid (FL*): a state which has electronic quasiparticles around a Luttinger-rule violating small Fermi surface along with neutral spinon excitations. We will show how using a recently introduced 'ancilla' theory of FL* phases in a single band model yields simple models which can be successfully compared to a wide range of ARPES experiments in Bi2212 and Bi2201 in both the nodal and anti-nodal regions of the Brillouin zone. |
Thursday, March 17, 2022 10:00AM - 10:12AM |
S64.00011: Numerical Study of Quantum Magnetism in Kitaev Material Xuan Zou, Shuo Liu, Wenan Guo, Hong Yao In this talk, we will present a sign-problem free Monte Carlo study of quantum magnetism in the honeycomb Kitaev-Heisenberg model with external magnetic fields. We obtained the quantum critical points and finite temperature Berezinskii-Kosterlitz-Thouless transition between the magnetically (long-range or quasi-long-range) ordered phase to the spin polarized phase. |
Thursday, March 17, 2022 10:12AM - 10:24AM |
S64.00012: Artificial electric field and electron hydrodynamics Omid Tavakol, Yong-Baek Kim In the electron dynamics in quantum matter, the Berry curvature of the electronic wave function provides the artificial magnetic field (AMF) in momentum space, which leads to non-trivial contributions to transport coefficients. It is known that in the presence of electron-electron and/or electron-phonon interactions, there is an extra contribution to the electron dynamics due to the artificial electric field (AEF) in momentum space. In this work, we construct hydrodynamic equations for the electrons in time-reversal invariant but inversion-breaking systems and find the novel hydrodynamic coefficients related to the AEF. Furthermore, we investigate the novel linear and non-linear transport coefficients in presnce of the AEF. |
Thursday, March 17, 2022 10:24AM - 10:36AM |
S64.00013: Realization of fractonic quantum phases in the breathing pyrochlore lattice SangEun Han, Adarsh S Patri, Yong-Baek Kim Fractonic phases of matter are characterized as possessing unusual mobility restricted quasiparticle excitations, and a ground state degeneracy that is sub-extensive and geometry dependent. While there exist a number of exactly solvable models with interactions between multiple particles/spins, the realization of such models in real materials is extremely challenging. In this talk, we investigate a realistic novel fractonic phase of matter that arises from a quantum model of quadratic spin interaction on the breathing pyrochlore lattice. Using membrane operators, we demonstrate the existence of a sub-extensive ground state degeneracy explicitly depending on the lattice geometry. This work provides a natural and realistic scenario to realize such exotic phases of matter, and a promising foundation for future theoretical and experimental investigations. [arXiv:2109.03835] |
Thursday, March 17, 2022 10:36AM - 10:48AM |
S64.00014: Fracton hydrodynamics with broken spacetime symmetries Jinkang Guo Fracton hydrodynamics have attracted much research interest recently. We present our ongoing research about fracton hydrodynamics with broken time-reversal symmetry, both using numerical methods and using new effective field theory arguments which do not rely on the existence of a finite temperature thermal state. Our work sheds light into the nature of hydrodynamics in systems where Landau's hydrodynamic paradigm does not apply in an obvious way. |
Thursday, March 17, 2022 10:48AM - 11:00AM |
S64.00015: Evidence of a coupled electron-phonon liquid in NbGe2 Hung-Yu Yang, Xiaohan Yao, Vincent M Plisson, Shirin Mozaffari, Jan P Scheifers, Aikaterini Flessa Savvidou, Eun Sang Choi, Gregory T McCandless, Mathieu F Padlewski, Carsten Putzke, Philip J Moll, Julia Y Chan, Luis Balicas, Kenneth S Burch, Fazel Tafti Hydrodynamic electron flow can be realized when the momentum-conserving scatterings of electrons in a material are more frequent than the momentum-relaxing ones. In principle, momentum-conserving electron-phonon scatterings can be enhanced in a coupled electron-phonon liquid to fulfill the above condition, but the candidates remain rare. Here, we present NbGe2 as a new candidate of such a liquid with strong electron-phonon interactions, phonon-drag behavior, and pronounced phonon-electron couplings as evidenced by experiments of quantum oscillations, electrical and thermal transport, and Raman scattering. Possible design principles of a coupled electron-phonon liquid will be discussed. |
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