论文标题
量子度量引起的固有非线性电导率
Intrinsic nonlinear conductivities induced by the quantum metric
论文作者
论文摘要
二阶非线性电流源自三种物理机制：外部非线性drude和浆果曲率偶极子以及固有的浆果连接极化。在这里，我们预测了与量子度量相关的电流（电子波函数的量子几何特性）的新固有贡献。这种贡献表现在同时打破时间反转和反转对称的系统中。有趣的是，新的贡献本质上是消散性的，并有助于纵向和耗时的非线性霍尔反应。量子度量诱导的NL电流占主导地位的传递，在带边缘附近的平均时间逆转对称系统中，我们明确显示了拓扑抗fiferromagnets的传输。
The second-order nonlinear current originates from three physical mechanisms: extrinsic nonlinear Drude and Berry curvature dipole and intrinsic Berry connection polarizability. Here, we predict a new intrinsic contribution to the current related to the quantum metric, a quantum geometric property of the electronic wave function. This contribution manifests in systems that simultaneously break the time-reversal and the inversion symmetry. Interestingly, the new contribution is dissipative in nature and contributes to both longitudinal and the dissipative nonlinear Hall response. The quantum metric-induced NL current dominates transport in parity-time reversal symmetric systems near the band edges, something we show explicitly for topological antiferromagnets.
