Cited 13 time in webofscience Cited 10 time in scopus

Majorana fermions in the Kitaev quantum spin system alpha-RuCl3

Title
Majorana fermions in the Kitaev quantum spin system alpha-RuCl3
Authors
Do, Seung-HwanPark, Sang-YounYoshitake, JunkiNasu, JojiMotome, YukitoshiKwon, Yong SeungAdroja, D. T.Voneshen, D. J.Kim, KyooJang, T. -H.Park, J. -H.Choi, Kwang-YongJi, Sungdae
DGIST Authors
Kwon, Yong Seung
Issue Date
2017-11
Citation
Nature Physics, 13(11), 1079-1084
Type
Article
Article Type
Article
Keywords
STATEANYONS
ISSN
1745-2473
Abstract
Geometrical constraints to the electronic degrees of freedom within condensed-matter systems often give rise to topological quantum states of matter such as fractional quantum Hall states, topological insulators, and Weyl semimetals. In magnetism, theoretical studies predict an entangled magnetic quantum state with topological ordering and fractionalized spin excitations, the quantum spin liquid. In particular, the so-called Kitaev spin model, consisting of a network of spins on a honeycomb lattice, is predicted to host Majorana fermions as its excitations. By means of a combination of specific heat measurements and inelastic neutron scattering experiments, we demonstrate the emergence of Majorana fermions in single crystals of α-RuCl 3, an experimental realization of the Kitaev spin lattice. The specific heat data unveils a two-stage release of magnetic entropy that is characteristic of localized and itinerant Majorana fermions. The neutron scattering results corroborate this picture by revealing quasielastic excitations at low energies around the Brillouin zone centre and an hour-glass-like magnetic continuum at high energies. Our results confirm the presence of Majorana fermions in the Kitaev quantum spin liquid and provide an opportunity to build a unified conceptual framework for investigating fractionalized excitations in condensed matter. © 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/4849
DOI
10.1038/nphys4264
Publisher
Nature Publishing Group
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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