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 S68: Definitive Signatures of Quantum Spin Liquids and Predictions for ExperimentsInvited
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Sponsoring Units: GMAG Chair: Lucile Savary, Ecole Normale Superieure de Lyon Room: Room 420 |
Thursday, March 9, 2023 8:00AM - 8:36AM |
S68.00001: Primordial fractionalized phase in the anisotropic Kitaev model in a field and testable predictions for fractionalized excitations Invited Speaker: Nandini Trivedi We report the discovery of a rich phase diagram for two-dimensional quantum spin liquids (QSL) with anisotropic spin interactions in a field. The Kitaev model with bond dependent Ising interactions on a honeycomb lattice offers an exactly solvable model for Z2 quantum spin liquids with gapped fluxes and gapless linearly dispersing majorana fermions for isotropic coupling. The majorana fermions get gapped out in the anisotropic Toric code limit when one of the coupling strengths is much larger than the other two, leading to a gapped Z2 QSL, where the fluxes form the low energy excitations– bosonic Ising electric (e) and magnetic (m) charges and the composite fermion ε=exm. The effect of an external magnetic field h in the [111] direction is remarkably different on the gapless and the gapped Z2 QSL that stems from the difference in the nature of excitations in the two QSLs. While the former shows transitions to a gapped chiral QSL and a gapless U(1) QSL before the polarized paramagnet sets in, the latter gives way to a valence bond solid (VBS) phase with dimers on stronger bonds. The key to understanding this rich phenomenology is the Zeeman-field-induced hybridization between the gauge ε and majorana fermions resulting in a matter-gauge coupled gapped Z2 QSL at intermediate magnetic field and anisotropy – dubbed the Primordial Fractionalized (PF) phase. All the other phases in the field-anisotropy plane are naturally obtained from this primodial soup, highlighting the importance of our discovery. The momentum-dependent dynamical spin structure factor shows distinct signatures of fractionalization and the evolution of the multiple peaks as a function of the magnetic field allow us to make testable predictions for experiments. |
Thursday, March 9, 2023 8:36AM - 9:12AM |
S68.00002: Phonon dynamics in two- and three-dimensional Kitaev spin liquids Invited Speaker: Natalia Perkins In recent years, it has been shown that the phonon dynamics may serve as an indirect probe of fractionalization of spin degrees of freedom. Here we propose that the sound attenuation, measurable by the ultrasound experiments, allows for the characterization and identification of the Kitaev quantum spin liquid in both two- and three dimensions. In both cases, the sound attenuation has a characteristic angular and temperature dependences, which reflect the various nodal structures of Majorana fermions possible in the Kitaev spin liquids. We present our resuts for the sound attenuation in honeycomb and hyperhonecomb Kitaev models, since these two models are relevant for Kitaev candidate materials $alpha$-RuCl$_3$ and $eta$-Li$_2$IrO$_3$, respectively. |
Thursday, March 9, 2023 9:12AM - 9:48AM |
S68.00003: TBD Invited Speaker: Subhro Bhattacharjee
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Thursday, March 9, 2023 9:48AM - 10:24AM |
S68.00004: Designing Ru-based quantum spin liquid candidates: microscopic modelling and experimental signatures Invited Speaker: Roser Valenti The spin-orbit assisted Mott insulator α-RuCl3 has been one of the most discussed honeycomb Kitaev material candidates in recent years. While the material enters a so-called zigzag antiferromagnetic order at low temperatures, various experiments at finite temperature or finite magnetic field have been interpreted as hallmarks of Kitaev physics, a subject which is presently under intensive debate, specially in view of the fact that the magnetic exchange interactions are extremely sensitive to lattice effects. |
Thursday, March 9, 2023 10:24AM - 11:00AM |
S68.00005: Probing Spin Dynamics in Kitaev Magnets Invited Speaker: Johannes Knolle The honeycomb magnet α−RuCl$_3$ is a prime candidate material for realizing the Kitaev quantum spin liquid (QSL), but it shows long-range magnetic order at low temperature. Nevertheless, its broad inelastic neutron scattering (INS) response at finite frequency has been interpreted as that of a 'proximate QSL'. In this talk I will present our efforts to understand the dynamical spin response of Kitaev magnets. I will discuss the implications of different analytical and numerical calculations for experiments and highlight the importance of distinguishing finite temperature fluctuations from genuine quantum fractionalization signatures in frustrated magnets. |
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