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DC field response of hot carriers under circular polarized intense microwave fields in semiconductors limited to two-dimension

机译：二维有限度半导体中圆极化强微波场下热载流子的直流场响应

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摘要

Hot carrier dynamics under intense microwave fields is investigated theoretically for the case that the dominant scattering process is optical phonon emission, and the carrier motion limited to two-dimension is intrinsic. When the microwave amplitude is appropriately large, an accumulated distribution of carriers in momentum space appears. The system of this motion is found to cause various peculiar DC fields response, e.g. strong non-linearity, negative differential conductivity, and negative response, under realistic physical conditions [ J. Phys. Soc. Jpn 68 (1995) 2994]. In the proper strength of microwave and DC electric fields, especially in the case of circular polarized microwave fields, the carrier motions are converged to some trajectories in momentum space [Proceeding of 25th International Conference on the Physics of Semiconductors, 2001]. Resultantly a new type of accumulated distribution of carriers in momentum space appears. This situation is a sort of population inversion of carriers and causes various phenomena including a negative differential conductivity and/or a negative response appeared in the drift velocity vs. DC field relation not found in the case of linear polarized microwave fields. The carrier motion restricted in two-dimensional band may be essential and effective for these properties.
机译：从理论上研究了在强微波场下热载流子动力学，主要是散射过程是光子发射，而载流子运动仅限于二维。当微波振幅适当大时，出现在动量空间中的载流子的累积分布。发现这种运动的系统会引起各种特殊的直流场响应，例如。在现实的物理条件下具有很强的非线性，负电导率和负响应[J. Phys。 Soc。 Jpn 68（1995）2994]。在微波和直流电场的适当强度下，尤其是在圆极化微波场的情况下，载流子的运动会聚到动量空间中的某些轨迹上[第25届国际半导体物理会议论文集，2001年]。结果，出现了一种新型的动量空间中的载流子累积分布。这种情况是载流子的反转，并且引起各种现象，包括在线性极化微波场中未发现的漂移速度与DC场的关系中出现的负差电导率和/或负响应。对于这些特性，限制在二维带中的载波运动可能是必不可少且有效的。

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