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Magnetoelastic effects in the hyperhoneycomb Kitaev spin liquid

Journal Article · · Low Temperature Physics
DOI:https://doi.org/10.1063/10.0005801· OSTI ID:1831147
 [1];  [2];  [3]
  1. National Research Univ. Higher School of Economics, Moscow (Russia); University of Minnesota
  2. Lomonosov Moscow State Univ. (Russia)
  3. Univ. of Minnesota, Minneapolis, MN (United States)
In recent years, several magnetic Mott insulators with strong spin-orbit coupling were suggested to be proximate to the Kitaev quantum spin liquid, whose one of the most exciting features is the fractionalization of spin excitations into itinerant Majorana fermions and static Z2 fluxes. Unfortunately, the ground states of these systems cannot be easily captured by experiment, remaining featureless to conventional local probes. Here, we propose to study the signatures of fractionalized excitations by exploiting their coupling to the lattice vibrations, dubbed magnetoelastic coupling, which arises from the fact that the interaction between spins depends on the relative distance between them. We argue that the magnetoelastic coupling can lead to the distinct modification of the phonon dynamics, which can be observed by measuring renormalized phonon spectrum, the sound attenuation, and the phonon Hall viscosity. This makes the phonon dynamics a promising tool for the characterization and identification of quantum spin liquid phases. In this work, we focus on the magnetoelastic effects in the three-dimensional Kitaev model realized on the hyperhoneycomb lattice. Here, the hyperhoneycomb Kitaev spin liquid is particularly interesting since the strong Kitaev interaction was observed in the Kitaev magnet β-Li2IrO3, for which the spin-orbit entangled Jeff = 1/2 moments of iridium ions form precisely the hyperhoneycomb lattice.
Research Organization:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0018056
OSTI ID:
1831147
Journal Information:
Low Temperature Physics, Journal Name: Low Temperature Physics Journal Issue: 9 Vol. 47; ISSN 1063-777X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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