Ferroelectricity-driven phonon Berry curvature and non-linear phonon Hall transports
| Autor: | Im, Jino, Kim, Choong H., Jin, Hosub |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Nano Letters 22, 8281 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1021/acs.nanolett.2c03095 |
| Popis: | Berry curvature (BC) governs topological phases of matter and generates anomalous transport. When a magnetic field is applied, phonons can acquire BC indirectly through spin-lattice coupling, leading to a linear phonon Hall effect. Here, we show that polar lattice distortion directly couples to a phonon BC dipole, which causes a switchable non-linear phonon Hall effect. In a SnS monolayer, the in-plane ferroelectricity induces a phonon BC and leads to the phononic version of the non-volatile BC memory effect. As a new type of ferroelectricity-phonon coupling, the phonon Rashba effect emerges and opens a mass-gap in tilted Weyl phonon modes, resulting in a large phonon BC dipole. Furthermore, our ab initio non-equilibrium molecular dynamics simulations reveal that non-linear phonon Hall transport occurs in a controllable manner via ferroelectric switching. The ferroelectricity-driven phonon BC and corresponding non-linear phonon transports provide a novel scheme for constructing topological phononic transport/memory devices. Comment: 12pages, 4 figures |
| Databáze: | arXiv |
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