论文标题
偏移热电流及其应用于电子偶联系统的理论
Theory of shift heat current and its application to electron-phonon coupled systems
论文作者
论文摘要
我们提出了移动电流“移位热电流”的热电流类似物。我们通过图解方法研究了对应用的AC电场对非线性热电流的响应，并为二阶直流热电流响应得出了微观表达。结果，我们发现移位热电流与移位矢量有关，这是一个几何量，也出现在移位电流的表达式中。直接取决于化学电位的移位热电流直接取决于并可以通过化学电位进行控制。此外，我们将图解方法应用于电子 - 音波耦合系统，并且发现即使只有声子受到外部场的激发，换档热电流的幅度也由电子的能量尺度（而不是声子的能量尺度）确定。
We propose a heat current analog of the shift current, "shift heat current". We study nonlinear heat current responses to an applied ac electric field by a diagrammatic method and derive a microscopic expression for the second order dc heat current response. As a result, we find that the shift heat current is related to the shift vector, a geometric quantity that also appears in the expression for the shift current. The shift heat current directly depends on and can be controlled through the chemical potential. In addition, we apply the diagrammatic method to electron-phonon coupled systems, and we find that even if only the phonons are excited by an external field, the amplitude of the shift heat current is determined by the energy scale of electrons, not of phonons.
