论文标题
铁电驱动的声子浆果曲率和非线性声子大厅运输
Ferroelectricity-driven phonon Berry curvature and non-linear phonon Hall transports
论文作者
论文摘要
浆果曲率（BC）控制物质的拓扑阶段并产生异常运输。当应用磁场时，声子可以通过自旋晶格耦合间接获取BC，从而导致线性声子大厅效应。在这里，我们表明极地晶格失真将直接耦合到声子BC偶极子，这会导致可切换的非线性声子效果。在SNS单层中，平板内铁电性诱导声子BC，并导致非挥发性BC内存效应的语音版本。作为一种新型的铁电性 - 音纸耦合，声子rashba效应出现并打开倾斜的Weyl声子模式的质量间隙，从而导致大型声子BC偶极子。此外，我们的从头算非平衡分子动力学模拟表明，非线性声子大厅的传输通过铁电交换以可控制的方式发生。铁电驱动的声子BC和相应的非线性声子传输为构建拓扑语音传输/记忆设备提供了一种新颖的方案。
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.
