论文标题
非线性热电流的量子动力学理论
Quantum kinetic theory of nonlinear thermal current
论文作者
论文摘要
我们研究了温度梯度诱导的二阶非线性电子热传输。我们开发了量子动力学理论框架，以描述在存在温度梯度的情况下的热传输。使用此功能，我们预测了固有的散射时间独立的非线性热电流，除了已知的外部非线性drude和Berry曲率偶极子的贡献。我们表明，固有的热电流由频带几何量确定，并且仅在空间反转和时间反转对称性的系统中仅是零。我们采用开发的理论来研究倾斜的大型狄拉克系统中的热响应。我们表明，除了不同的散射时间依赖性外，各种当前的贡献在低温限制下具有不同的温度依赖性。我们针对非线性热运输的系统和全面理论为未来的关于固有热反应的理论和实验研究铺平了道路。
We investigate the second-order nonlinear electronic thermal transport induced by temperature gradient. We develop the quantum kinetic theory framework to describe thermal transport in presence of a temperature gradient. Using this, we predict an intrinsic scattering time independent nonlinear thermal current in addition to the known extrinsic nonlinear Drude and Berry curvature dipole contributions. We show that the intrinsic thermal current is determined by the band geometric quantities and is non-zero only in systems where both the space inversion and time-reversal symmetries are broken. We employ the developed theory to study the thermal response in tilted massive Dirac systems. We show that besides the different scattering time dependence, the various current contributions have distinct temperature dependence in the low temperature limit. Our systematic and comprehensive theory for nonlinear thermal transport paves the way for future theoretical and experimental studies on intrinsic thermal responses.
