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 CrossingSymmetric Approach Nicholas Corkill, Thomas L Ainsworth, Gabriel Kotliar, Khandker F Quader We develop a crossingsymmetric model for microscopically obtaining Fermi liquid interactions in 2D Fermi systems. Partial resummation of Feynman diagrams, renormalization of quasiparticle interactions, and the preservation of crossing symmetry leads to coupled, nonlinear integral equations in terms of momentumdependent 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 selfconsistently 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: Spinorbit coupling and Pwave 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 manybody theory. 
Thursday, March 17, 2022 8:24AM  8:36AM 
S64.00003: The Higgs condensate is a symmetryprotected topological phase Ruben Verresen, Umberto Borla, Sergej Moroz, Ashvin Vishwanath, Ryan Thorngren Gauge theories are ubiquitous even outside the standard model, arising as effective lowenergy descriptions of manybody 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 confusionits apparent description as a symmetrybreaking 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 symmetryprotected 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 superconductorsthe Higgs phase associated to electromagnetism. 
Thursday, March 17, 2022 8:36AM  8:48AM 
S64.00004: AxialCurrent Anomaly in Euler Fluid Pavel Wiegmann, Alexandre G Abanov We argue that a close analog of the axialcurrent 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, HongChen Jiang A system of noninteracting 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 onedimensional 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, nonstandard 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 presentday realizable experiment for detecting, in a metal, a novel hydrodynamic phenomenon: the presence of rotational dissipation in an otherwiseisotropic fluid. 
Thursday, March 17, 2022 9:12AM  9:24AM 
S64.00007: NonAbelian fracton order from gauging a mixture of subsystem and global symmetries YiTing Tu, PoYao Chang We construct a onestep 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 nonAbelian 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 nontrivially under spatial point group symmetries, currentsin nonstandard representations of the point group, and/or higherderiative 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 almostconserved 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 manybody system with simultaneous charge/mass, dipole/center of mass, and momentum conservation. This hydrodynamic effective theory is unstable below four spatial dimensions: dipoleconserving fluids at rest become unstable to fluctuations, and are governed not by hydrodynamics, but by a fractonic generalization of the KardarParisiZhang universality class. Numerical simulations of onedimensional 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 nonequilbrium 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 hightemperature superconductivity in the cuprates present a longstanding theoretical challenge. Various emerging phases have been thoroughly studied experimentally, including angleresolved 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 Luttingerrule 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 antinodal 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 signproblem free Monte Carlo study of quantum magnetism in the honeycomb KitaevHeisenberg model with external magnetic fields. We obtained the quantum critical points and finite temperature BerezinskiiKosterlitzThouless transition between the magnetically (longrange or quasilongrange) 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, YongBaek 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 nontrivial contributions to transport coefficients. It is known that in the presence of electronelectron and/or electronphonon 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 timereversal invariant but inversionbreaking systems and find the novel hydrodynamic coefficients related to the AEF. Furthermore, we investigate the novel linear and nonlinear 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, YongBaek Kim Fractonic phases of matter are characterized as possessing unusual mobility restricted quasiparticle excitations, and a ground state degeneracy that is subextensive 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 subextensive 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 timereversal 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 electronphonon liquid in NbGe_{2} HungYu 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 momentumconserving scatterings of electrons in a material are more frequent than the momentumrelaxing ones. In principle, momentumconserving electronphonon scatterings can be enhanced in a coupled electronphonon liquid to fulfill the above condition, but the candidates remain rare. Here, we present NbGe_{2} as a new candidate of such a liquid with strong electronphonon interactions, phonondrag behavior, and pronounced phononelectron couplings as evidenced by experiments of quantum oscillations, electrical and thermal transport, and Raman scattering. Possible design principles of a coupled electronphonon liquid will be discussed. 
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