二维电子气中依赖能量的电子-电子散射和自旋动力学
Energy-Dependent Electron-Electron Scattering and Spin Dynamics in a Two Dimensional Electron Gas
摘要：
在Dyakonov-Perel机制占主导地位的简并二维电子气中，电子自旋动力学的测量被用来研究电子散射时间（tp*）作为费米能附近能量的函数。接近费米能的自旋演化是振荡的，表明自旋动力学的准碰撞自由制度。随着能量的增加，发生了向指数的、碰撞主导的自旋衰变的转变。使用蒙特卡罗模拟方法提取频率和tp* 的值。在费米能tp* 是非常接近的系综动量弛豫时间（tp）从电子迁移率。对于更高的能量TP* 下降二次方，符合理论预期的电子-电子散射的发生，这是抑制泡利原理在费米能量。
英文摘要：
Measurements of spin dynamics of electrons in a degenerate two dimensional electron gas, where the Dyakonov-Perel mechanism is dominant, have been used to investigate the electron scattering time (tp*) as a function of energy near the Fermi energy. Close to the Fermi energy the spin evolution is oscillatory, indicating a quasi-collision-free regime of spin dynamics. As the energy is increased a transition to exponential, collision-dominated, spin decay occurs. The frequency and the value of tp* are extracted using a Monte Carlo simulation method. At the Fermi energy tp* is very close to the ensemble momentum relaxation time (tp) obtained from the electron mobility. For higher energies tp* falls quadratically, consistent with theoretical expectations for the onset of electron-electron scattering which is inhibited by the Pauli principle at the Fermi energy.
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