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首页> 外文期刊>Physica status solidi, B. Basic research >PHONON EMISSION BY HOT TWO-DIMENSIONAL ELECTRONS IN GALLIUM-ARSENIDE DEVICES - THE MYSTERY OF THE MISSING LONGITUDINAL MODE
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PHONON EMISSION BY HOT TWO-DIMENSIONAL ELECTRONS IN GALLIUM-ARSENIDE DEVICES - THE MYSTERY OF THE MISSING LONGITUDINAL MODE

机译:砷化镓装置中二维热电子的声子发射-纵向模式消失的谜

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摘要

A peculiar feature of the phonon emission by a warm two-dimensional electron gas (2DEG) in a gallium-arsenide (GaAs) heterojunction is that, compared with tile transverse acoustic (TA) mode. emission of the longitudinal acoustic (LA) mode is very weak, In bulk GaAs, LA emission is much stronger because the LA mode couples to electrons in GaAs as the deformation potential (DP) whereas the TA does not. One possible reason for the anomaly is that in a 2DEG, owing to the reduction in phase space for electron scattering, the electron-phonon interaction is cut off at small wavevector, q, before DP coupling (proportional to q) can dominate over piezoelectric (PE) coupling (proportional to q(-1)). [References: 5]
机译:砷化镓(GaAs)异质结中温暖的二维电子气(2DEG)发出的声子的一个特殊特征是,与平铺横向声(TA)模式相比。纵向声(LA)模的发射非常微弱。在体GaAs中,LA发射要强得多,因为LA模作为变形势(DP)耦合到GaAs中的电子,而TA则不。出现异常的一个可能原因是,在2DEG中,由于电子散射的相空间减少,在DP耦合(与q成正比)可以主导压电之前,电子-声子相互作用在小波矢q处被切断。 PE)耦合(与q(-1)成比例)。 [参考:5]

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