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Identification of a Kitaev quantum spin liquid by magnetic field angle dependence

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Title
Identification of a Kitaev quantum spin liquid by magnetic field angle dependence
Author(s)
Hwang, Kyusung; Ara Go; Seong, Ji Heon; Shibauchi, Takasada; Moon, Eun-Gook
Publication Date
2022-01
Journal
Nature Communications, v.13, no.1
Publisher
Nature Research
Abstract
© 2022, The Author(s).Quantum spin liquids realize massive entanglement and fractional quasiparticles from localized spins, proposed as an avenue for quantum science and technology. In particular, topological quantum computations are suggested in the non-abelian phase of Kitaev quantum spin liquid with Majorana fermions, and detection of Majorana fermions is one of the most outstanding problems in modern condensed matter physics. Here, we propose a concrete way to identify the non-abelian Kitaev quantum spin liquid by magnetic field angle dependence. Topologically protected critical lines exist on a plane of magnetic field angles, and their shapes are determined by microscopic spin interactions. A chirality operator plays a key role in demonstrating microscopic dependences of the critical lines. We also show that the chirality operator can be used to evaluate topological properties of the non-abelian Kitaev quantum spin liquid without relying on Majorana fermion descriptions. Experimental criteria for the non-abelian spin liquid state are provided for future experiments.
URI
https://pr.ibs.re.kr/handle/8788114/11208
DOI
10.1038/s41467-021-27943-9
ISSN
2041-1723
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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