Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions

Abstract Recently, the observation of large thermal Hall conductivities in correlated insulators with no apparent broken symmetry has generated immense interest and debates on the underlying ground states. Here, considering frustrated magnets with bond-dependent interactions, which are realized in t...

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Autores principales:	Li Ern Chern, Finn Lasse Buessen, Yong Baek Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/e8a664a660ba45a0ba929e9c15339d58
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spelling	oai:doaj.org-article:e8a664a660ba45a0ba929e9c15339d582021-12-02T13:26:58ZClassical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions10.1038/s41535-021-00331-82397-4648https://doaj.org/article/e8a664a660ba45a0ba929e9c15339d582021-03-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00331-8https://doaj.org/toc/2397-4648Abstract Recently, the observation of large thermal Hall conductivities in correlated insulators with no apparent broken symmetry has generated immense interest and debates on the underlying ground states. Here, considering frustrated magnets with bond-dependent interactions, which are realized in the so-called Kitaev materials, we theoretically demonstrate that a large thermal Hall conductivity can originate from a classical ground state without any magnetic order. We discover a liquid state of magnetic vortices, which are inhomogeneous spin textures embedded in the background of polarized spins, under out-of-plane magnetic fields. In the classical regime, different configurations of vortices form an effectively degenerate manifold. We study the static and dynamical properties of the magnetic vortex liquid state at zero and finite temperatures. In particular, we show that the spin excitation spectrum resembles a continuum of nearly flat Chern bands, which ultimately leads to a large thermal Hall conductivity. Possible connections to experiments are discussed.Li Ern ChernFinn Lasse BuessenYong Baek KimNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Li Ern Chern Finn Lasse Buessen Yong Baek Kim Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions
description	Abstract Recently, the observation of large thermal Hall conductivities in correlated insulators with no apparent broken symmetry has generated immense interest and debates on the underlying ground states. Here, considering frustrated magnets with bond-dependent interactions, which are realized in the so-called Kitaev materials, we theoretically demonstrate that a large thermal Hall conductivity can originate from a classical ground state without any magnetic order. We discover a liquid state of magnetic vortices, which are inhomogeneous spin textures embedded in the background of polarized spins, under out-of-plane magnetic fields. In the classical regime, different configurations of vortices form an effectively degenerate manifold. We study the static and dynamical properties of the magnetic vortex liquid state at zero and finite temperatures. In particular, we show that the spin excitation spectrum resembles a continuum of nearly flat Chern bands, which ultimately leads to a large thermal Hall conductivity. Possible connections to experiments are discussed.
format	article
author	Li Ern Chern Finn Lasse Buessen Yong Baek Kim
author_facet	Li Ern Chern Finn Lasse Buessen Yong Baek Kim
author_sort	Li Ern Chern
title	Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions
title_short	Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions
title_full	Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions
title_fullStr	Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions
title_full_unstemmed	Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions
title_sort	classical magnetic vortex liquid and large thermal hall conductivity in frustrated magnets with bond-dependent interactions
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/e8a664a660ba45a0ba929e9c15339d58
work_keys_str_mv	AT liernchern classicalmagneticvortexliquidandlargethermalhallconductivityinfrustratedmagnetswithbonddependentinteractions AT finnlassebuessen classicalmagneticvortexliquidandlargethermalhallconductivityinfrustratedmagnetswithbonddependentinteractions AT yongbaekkim classicalmagneticvortexliquidandlargethermalhallconductivityinfrustratedmagnetswithbonddependentinteractions
_version_	1718393067209228288

Classical magnetic vortex liquid and large thermal Hall conductivity in frustrated magnets with bond-dependent interactions

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