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The phonon thermal Hall angle in black phosphorus | | Xiaokang Li
; Yo Machida
; Alaska Subedi
; Zengwei Zhu
; Liang Li
; Kamran Behnia
; | | Date: |
2 Jan 2023 | | Abstract: | The origin of phonon thermal Hall Effect (THE) observed in a variety of
insulators is yet to be identified. Here, we report on the observation of a
thermal Hall conductivity in a non-magnetic elemental insulator, with an
amplitude exceeding what has been previously observed. In black phosphorus
(BP), the longitudinal ($kappa_{ii}$), and the transverse, $kappa_{ij}$,
thermal conductivities peak at the same temperature and at this peak
temperature, the $kappa_{ij}/kappa_{jj}/B $ is $approx 10^{-4}$-$10^{-3}$
T$^{-1}$. Both these features are shared by other insulators displaying THE,
despite an absolute amplitude spreading over three orders of magnitude. The
absence of correlation between the thermal Hall angle and the phonon
mean-free-path imposes a severe constraint for theoretical scenarios of THE. We
show that in BP a longitudinal and a transverse acoustic phonon mode
anti-cross, facilitating wave-like transport across modes and the anisotropic
charge distribution surrounding atomic bonds, paving the way for coupling with
magnetic field. | | Source: | arXiv, 2301.00603 | | Services: | Forum | Review | PDF | Favorites | |
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