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首页> 外文期刊>Physical review >Mechanism Of Microwave-induced Photoluminescence Modulation And Optically Detected Resonances Due To A Two-dimensional Electron Gas In A Heterostructure
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Mechanism Of Microwave-induced Photoluminescence Modulation And Optically Detected Resonances Due To A Two-dimensional Electron Gas In A Heterostructure

机译：异质结构中二维电子气引起的微波致发光调制和光学检测共振的机理

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摘要

The effect of pulsed microwave (mw) irradiation (at 36 GHz) on the photoluminescence (PL) of modulation-doped GaAs/AlGaAs quantum wells (MDQWs) containing a two-dimensional electron gas (2DEG) is studied by time-resolved spectroscopy at an ambient temperature of 2 K. The temporal response of the two-dimensional electron-hole PL to a short mw pulse reveals remarkable PL intensity kinetics with overshoots and a long decay time (> 10 ns) after the mw pulse terminates. The observed effects are explained by the temporal evolution of the energy redistribution of photoexcited holes. This redistribution is caused by nonequilibrium, long-lived acoustic phonons that are emitted by the mw heated 2DEG and are absorbed by the holes. Optically detected resonances (ODRs) of the 2DEG are observed in both the two-dimensional electron-hole PL band and in the PL line of excitons that are photoexcited in the undoped superlattice adjoining the MDQW. This provides an experimental proof that the emitted acoustic phonons propagate ballistically throughout the entire heterostructure and induce an effective, long range, indirect interaction between the mw heated 2DEG and the holes (as well as with the spatially separated excitons). This interaction constitutes the underlying mechanism of the mw-induced ODRs observed in heterostructures containing a 2DEG.
机译：通过时间分辨光谱研究了脉冲微波（mw）辐射（36 GHz）对包含二维电子气（2DEG）的调制掺杂GaAs / AlGaAs量子阱（MDQWs）的光致发光（PL）的影响。环境温度为2K。二维电子空穴PL对短mw脉冲的时间响应显示出显着的PL强度动力学，具有超调和mw脉冲终止后的长衰减时间（> 10 ns）。观察到的效应可以通过光激发空穴的能量重新分布的时间演变来解释。这种重新分布是由微波加热的2DEG发射并被空穴吸收而引起的非平衡，长寿命声子引起的。在二维电子空穴PL带和在与MDQW相邻的未掺杂超晶格中被光激发的激子的PL线中均观察到了2DEG的光学检测共振（ODR）。这提供了实验证明，发射的声子在整个异质结构中弹道传播，并在mw加热的2DEG和空穴（以及与空间分离的激子）之间引起有效的，长距离的间接相互作用。这种相互作用构成了在包含2DEG的异质结构中观察到的mw诱导的ODR的潜在机制。

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