光致弹道电流的扩大磁聚焦半径
Enlarged magnetic focusing radius of photoinduced ballistic currents
摘要：
我们利用GaAs基量子点接触作为介观探测器来分析垂直磁场下二维电子气中光生电子的弹道流。而电荷输运实验总是测量经典的回旋半径，我们发现，这显着变化时，检测光致非平衡电流在磁场。实验确定的轨迹半径令人惊讶地超过了经典的回旋加速器值。蒙特卡罗模拟表明电子-电子散射是根本原因。
英文摘要：
We exploit GaAs-based quantum point contacts as mesoscopic detectors to analyze the ballistic flow of photogenerated electrons in a two-dimensional electron gas at a perpendicular magnetic field. Whereas charge transport experiments always measure the classical cyclotron radius, we show that this changes dramatically when detecting the photoinduced non-equilibrium current in magnetic fields. The experimentally determined radius of the trajectories surprisingly exceeds the classical cyclotron value by far. Monte Carlo simulations suggest electron-electron scattering as the underlying reason.
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