论文标题
反应均匀的平面电场的异常激子运输
Anomalous exciton transport in response to a uniform, in-plane electric field
论文作者
论文摘要
激子是中性物体，天真地对均匀的电场不应反应。基础电子带的浆果曲率会改变这一结论吗？在这项工作中，我们表明浆果曲率确实会导致二维材料中抗激元的异常运输，但面积均匀，平面内电场。通过考虑组成的电子和孔动力学，我们证明了存在一个相应异常速度在同一方向上的策略。我们通过半经典和完全量子的机械分析建立了激子的质量运动中心，并阐明了Bloch振荡在实现此效果中的关键作用。我们将过渡金属二甲藻元化杂脂鉴定为观察效果的候选材料。
Excitons are neutral objects, that, naively, should have no response to a uniform, electric field. Could the Berry curvature of the underlying electronic bands alter this conclusion? In this work, we show that Berry curvature can indeed lead to anomalous transport for excitons in 2D materials subject to a uniform, in-plane electric field. By considering the constituent electron and hole dynamics, we demonstrate that there exists a regime for which the corresponding anomalous velocities are in the same direction. We establish the resulting center of mass motion of the exciton through both a semiclassical and fully quantum mechanical analysis, and elucidate the critical role of Bloch oscillations in achieving this effect. We identify transition metal dichalcogenide heterobilayers as candidate materials to observe the effect.
