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Heating and cooling of a two-dimensional electron gas by terahertz radiation

机译:通过太赫兹辐射加热和冷却二维电子气

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摘要

The absorption of terahertz radiation by free charge carriers in n-type semiconductor quantum wells accompanied by the interaction of electrons with acoustic and optical phonons is studied. It is shown that intrasubband optical transitions can cause both heating and cooling of the electron gas. The cooling of charge carriers occurs in a certain temperature and radiation frequency region where light is most efficiently absorbed due to intrasubband transitions with emission of optical phonons. In GaAs quantum wells, the optical cooling of electrons occurs most efficiently at liquid nitrogen temperatures, while cooling is possible even at room temperature in GaN heterostructures.
机译:研究了n型半导体量子阱中自由电荷载流子对太赫兹辐射的吸收,并伴随着电子与声子和光子的相互作用。结果表明,子带内的光学跃迁可以引起电子气的加热和冷却。电荷载流子的冷却发生在某个温度和辐射频率区域,在该区域中,由于子带内跃迁以及光子的发射,光被最有效地吸收。在GaAs量子阱中,电子的光学冷却在液氮温度下最有效,而即使在室温下GaN异质结构中也可以冷却。

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