论文标题
由相关绝缘子中的集体激发驱动的散装光伏效应
Bulk Photovoltaic Effect Driven by Collective Excitations in a Correlated Insulator
论文作者
论文摘要
我们研究了具有相关驱动电子铁电性的集体量子状态，从而将散装光伏效应纠正到电流中。我们通过显式实时动力学计算显示，相对于在常规绝缘子中获得的值，应用电场对电子阶参数参数的影响会导致大量光伏效应的强大增强。增强功能包括在子兰间隙频率上的共振增强，这是由于光学主动集体模式的激发而引起的，以及由电子阶的非谐波变形引起的宽带增强。可变形的电子阶参数产生了对大量光伏效应的注入电流贡献，该效应在刚带近似值中完全不存在于时间反转对称材料中。我们的发现表明，相关效应可以导致大量光伏效应，并证明有序状态的集体行为可以产生大型的非线性光学响应。
We investigate the bulk photovoltaic effect, which rectifies light into electric current, in a collective quantum state with correlation driven electronic ferroelectricity. We show via explicit real-time dynamical calculations that the effect of the applied electric field on the electronic order parameter leads to a strong enhancement of the bulk photovoltaic effect relative to the values obtained in a conventional insulator. The enhancements include both resonant enhancements at sub-band-gap frequencies, arising from excitation of optically active collective modes, and broadband enhancements arising from nonresonant deformations of the electronic order. The deformable electronic order parameter produces an injection current contribution to the bulk photovoltaic effect that is entirely absent in a rigid-band approximation to a time-reversal symmetric material. Our findings establish that correlation effects can lead to the bulk photovoltaic effect and demonstrate that the collective behavior of ordered states can yield large nonlinear optical responses.
