Berry phase of phonons and thermal Hall effect in nonmagnetic insulators
| Autor: | Saito, Takuma, Misaki, Kou, Ishizuka, Hiroaki, Nagaosa, Naoto |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 123, 255901 (2019) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.123.255901 |
| Popis: | A mechanism for phonon Hall effect (PHE) in non-magnetic insulators under an external magnetic field is theoretically studied. PHE is known in (para)magnetic compounds, where the magnetic moments and spin-orbit interaction play an essential role. In sharp contrast, we here show that a non-zero Berry curvature of acoustic phonons is induced by an external magnetic field due to the correction to the adiabatic Born-Oppenheimer approximation. This results in the finite thermal Hall conductivity $\kappa_H$ in nonmagnetic band insulators. Our estimate of $\kappa_H$ for a simple model gives $\kappa_H \sim 1.0\times 10^{-5} $[W/Km] at $ B=10 $[T] and $ T=150 $[K]. Comment: 5 pages, 2 figures |
| Databáze: | arXiv |
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