Majorana-fermion origin of the planar thermal Hall effect in the Kitaev magnet $α$-RuCl$_3$
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arXiv
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| Main Authors: | , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866914713570377728 |
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| author | Imamura, K. Suetsugu, S. Mizukami, Y. Yoshida, Y. Hashimoto, K. Ohtsuka, K. Kasahara, Y. Kurita, N. Tanaka, H. Noh, P. Nasu, J. Moon, E. -G. Matsuda, Y. Shibauchi, T. |
| author_facet | Imamura, K. Suetsugu, S. Mizukami, Y. Yoshida, Y. Hashimoto, K. Ohtsuka, K. Kasahara, Y. Kurita, N. Tanaka, H. Noh, P. Nasu, J. Moon, E. -G. Matsuda, Y. Shibauchi, T. |
| contents | The field-induced quantum disordered state of layered honeycomb magnet $α$-RuCl$_3$ is a prime candidate for Kitaev spin liquids hosting Majorana fermions and non-Abelian anyons. Recent observations of anomalous planar thermal Hall effect demonstrate a topological edge mode, but whether it originates from Majorana fermions or bosonic magnons remains controversial. Here we distinguish these origins from low-temperature measurements of high-resolution specific heat and thermal Hall conductivity with rotating in-plane fields. In the honeycomb bond direction, a distinct closure of the low-energy bulk gap is observed concomitantly with the sign reversal of the Hall effect. General discussions of topological bands show that this is the hallmark of an angle-rotation-induced topological transition of fermions, providing conclusive evidence for the Majorana-fermion origin of the thermal Hall effect in $α$-RuCl$_3$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2305_10619 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Majorana-fermion origin of the planar thermal Hall effect in the Kitaev magnet $α$-RuCl$_3$ Imamura, K. Suetsugu, S. Mizukami, Y. Yoshida, Y. Hashimoto, K. Ohtsuka, K. Kasahara, Y. Kurita, N. Tanaka, H. Noh, P. Nasu, J. Moon, E. -G. Matsuda, Y. Shibauchi, T. Strongly Correlated Electrons Materials Science The field-induced quantum disordered state of layered honeycomb magnet $α$-RuCl$_3$ is a prime candidate for Kitaev spin liquids hosting Majorana fermions and non-Abelian anyons. Recent observations of anomalous planar thermal Hall effect demonstrate a topological edge mode, but whether it originates from Majorana fermions or bosonic magnons remains controversial. Here we distinguish these origins from low-temperature measurements of high-resolution specific heat and thermal Hall conductivity with rotating in-plane fields. In the honeycomb bond direction, a distinct closure of the low-energy bulk gap is observed concomitantly with the sign reversal of the Hall effect. General discussions of topological bands show that this is the hallmark of an angle-rotation-induced topological transition of fermions, providing conclusive evidence for the Majorana-fermion origin of the thermal Hall effect in $α$-RuCl$_3$. |
| title | Majorana-fermion origin of the planar thermal Hall effect in the Kitaev magnet $α$-RuCl$_3$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2305.10619 |