Classical and quantum spin dynamics of the honeycomb Γ model

Samarakoon, Anjana M.; Wachtel, Gideon; Yamaji, Youhei; Tennant, David Alan; Batista, Cristian D.; Kim, Yong Baek

doi:10.1103/PhysRevB.98.045121

Title: Classical and quantum spin dynamics of the honeycomb $Γ$ model

Journal Article · Sun Jul 15 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.98.045121· OSTI ID:1530111

Samarakoon, Anjana M. ^[1]; Wachtel, Gideon ^[2]; Yamaji, Youhei ^[3];

^[1]; Batista, Cristian D. ^[4]; Kim, Yong Baek ^[5]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Toronto, Toronto, ON (Canada); The Hebrew Univ., Jerusalem (Israel)
The Univ. of Tokyo, Tokyo (Japan); JST PRESTO, Tokyo (Japan)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Toronto, Toronto, ON (Canada); Canadian Institute for Advanced Research, Toronto, ON (Canada); Korea Inst. for Advanced Study, Seoul (Korea)

Quantum-to-classical crossover is a fundamental question in dynamics of quantum many-body systems. In frustrated magnets, for example, it is highly nontrivial to describe the crossover from the classical spin liquid with a macroscopically degenerate ground-state manifold to the quantum spin liquid phase with fractionalized excitations. This is an important issue, as we often encounter the demand for a sharp distinction between the classical and quantum spin liquid behaviors in real materials. Here we take the example of the classical spin liquid in a frustrated magnet with novel bond-dependent interactions to investigate the classical dynamics, and critically compare it with quantum dynamics in the same system. In particular, we focus on signatures in the dynamical spin structure factor. Combining Landau-Lifshitz dynamics simulations and the analytical Martin-Siggia-Rose approach, we show that the low-energy spectra are described by relaxational dynamics and highly constrained by the zero mode structure of the underlying degenerate classical manifold. Further, the higher energy spectra can be explained by precessional dynamics. Surprisingly, many of these features can also be seen in the dynamical structure factor in the quantum model studied by finite-temperature exact diagonalization. Here, we discuss the implications of these results and their connection to recent experiments on frustrated magnets with strong spin-orbit coupling.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1530111

Alternate ID(s):: OSTI ID: 1460487

Journal Information:: Physical Review B, Vol. 98, Issue 4; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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Dynamical and thermal magnetic properties of the Kitaev spin liquid candidate α-RuCl3 Laurell, Pontus; Okamoto, Satoshi npj Quantum Materials, Vol. 5, Issue 1 https://doi.org/10.1038/s41535-019-0203-y	journal	January 2020
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Hidden Plaquette Order in a Classical Spin Liquid Stabilized by Strong Off-Diagonal Exchange Saha, Preetha; Fan, Zhijie; Zhang, Depei Physical Review Letters, Vol. 122, Issue 25 https://doi.org/10.1103/physrevlett.122.257204	journal	June 2019

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Title: Classical and quantum spin dynamics of the honeycomb $Γ$ model