Fakultät für Physik and Center for NanoScience, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, D-80539 München, Germany.
Nano Lett. 2010 Oct 13;10(10):3836-40. doi: 10.1021/nl102068v.
GaAs-based quantum point contacts (QPCs) are exploited to spatially resolve and analyze the ballistic, nonequilibrium flow of photogenerated electrons in a nanoscale circuit. Electron-hole pairs are photogenerated in a two-dimensional electron gas (2DEG), and the resulting current through an adjacent QPC is measured as a function of the laser spot position. The transmission of photogenerated electrons through the QPC is governed by the energy dispersion and the quantized momentum values of the electron modes in the QPC.
基于 GaAs 的量子点接触（QPC）被用于空间分辨和分析纳米级电路中光生电子的弹道、非平衡流动。电子-空穴对在二维电子气（2DEG）中产生，通过相邻的 QPC 的电流作为激光光斑位置的函数进行测量。光生电子通过 QPC 的传输由 QPC 中电子模式的能量色散和量子化动量值决定。
