The phonon thermal Hall angle in black phosphorus.

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 (κ_ii), and the transverse, κ_ij, thermal conductivities peak at the same temperature and at this peak temperature, the κ_ij/κ_jj/B is ≈ 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 f

SUBMITTER: Li X 

PROVIDER: S-EPMC9950068 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature