The planar thermal Hall conductivity in the Kitaev magnet {\alpha}-RuCl3
| Autor: | Czajka, Peter, Gao, Tong, Hirschberger, Max, Lampen-Kelley, Paula, Banerjee, Arnab, Quirk, Nicholas, Mandrus, David G., Nagler, Stephen E., Ong, N. P. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Nature Materials 22, 36 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41563-022-01397-w |
| Popis: | We report detailed measurements of the Onsager-like planar thermal Hall conductivity $\kappa_{xy}$ in $\alpha$-RuCl$_3$, a spin-liquid candidate of topical interest. With the thermal current ${\bf J}_{\rm Q}$ and magnetic field $\bf B\parallel a$ (zigzag axis), the observed $\kappa_{xy}/T$ varies strongly with temperature $T$ (1-10 K). The results are well-described by bosonic edge excitations which evolve to topological magnons at large $B$. Fits to $\kappa_{xy}/T$ yield a Chern number $\sim 1$ and a band energy $\omega_1\sim$1 meV, in agreement with sharp modes seen in electron spin-resonance experiments. The bosonic character is incompatible with half-quantization of $\kappa_{xy}/T$. Comment: 7 pages, 3 figures |
| Databáze: | arXiv |
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