| Autor: |
Lu Chen, Léna Le Roux, Gaël Grissonnanche, Marie-Eve Boulanger, Steven Thériault, Ruixing Liang, D. A. Bonn, W. N. Hardy, S. Pyon, T. Takayama, H. Takagi, Ke-Jun Xu, Zhi-Xun Shen, Louis Taillefer |
| Jazyk: |
angličtina |
| Rok vydání: |
2024 |
| Předmět: |
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| Zdroj: |
Physical Review X, Vol 14, Iss 4, p 041011 (2024) |
| Druh dokumentu: |
article |
| ISSN: |
2160-3308 |
| DOI: |
10.1103/PhysRevX.14.041011 |
| Popis: |
A surprising “planar” thermal Hall effect, whereby the field is parallel to the current, has recently been observed in a few magnetic insulators; this effect has been attributed to exotic excitations such as Majorana fermions or chiral magnons. Here, we investigate the possibility of a planar thermal Hall effect in three different cuprate materials, in which the conventional thermal Hall conductivity κ_{xy} (with an out-of-plane field perpendicular to the current) is dominated by either electrons or phonons. Our measurements show that the planar κ_{xy} from electrons in cuprates is zero, as expected from the absence of a Lorentz force in the planar configuration. By contrast, we observe a sizable planar κ_{xy} in those samples where the thermal Hall response is due to phonons, even though it should, in principle, be forbidden by the high crystal symmetry. Our findings call for a careful reexamination of the mechanisms responsible for the phonon thermal Hall effect in insulators. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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