期刊
PHYSICAL REVIEW LETTERS
卷 120, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.217205
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) [25220710, 15H02014, 15H02106, 15H05457, 15K13533, 16H02206, 16H00987, 16K05414, 17H01142, 18H04223, JP15H05852]
- Yamada Science Foundation
- Toray Science Foundation
The Kitaev quantum spin liquid displays the fractionalization of quantum spins into Majorana fermions. The emergent Majorana edge current is predicted to manifest itself in the form of a finite thermal Hall effect, a feature commonly discussed in topological superconductors. Here we report on thermal Hall conductivity kappa(xy) measurements in alpha-RuCl3, a candidate Kitaev magnet with the two-dimensional honeycomb lattice. In a spin-liquid (Kitaev paramagnetic) state below the temperature characterized by the Kitaev interaction J(K)/k(B) similar to 80 K, positive kappa(xy) develops gradually upon cooling, demonstrating the presence of highly unusual itinerant excitations. Although the zero-temperature property is masked by the magnetic ordering at T-N = 7 K, the sign, magnitude, and T dependence of kappa(xy)/T at intermediate temperatures follows the predicted trend of the itinerant Majorana excitations.
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