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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Tuning the exciton luminescence in an acoustically depleted two-dimensional electron gas
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Tuning the exciton luminescence in an acoustically depleted two-dimensional electron gas

机译：在声学耗竭的二维电子气中调谐激子发光

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摘要

Standing-wave piezoelectric fields can be used to vary spatially and temporally charge conditions in GaAs/AlGaAs quantum wells (QWs), offering a versatile tool to control the two-dimensional electron gas (2DEG) density in the well. A LiNbO_3 piezoelectric resonator imparts a MHz-frequency oscillating piezoelectric field with a controllable ratio of the in-plane and the vertical field components to a 2DEG placed in close proximity to the plate surface. This allows us to dynamically tune the charge state in the plane of the QW and to influence the photoluminescence spectra. It is found that spatially distributed regions of depleted and accumulated electron densities are formed in the QW plane due to the in-plane components of the piezoelectric field. The photoluminescence spectrum then varies both spatially and temporally, exhibiting an electron-hole plasma recombination at large electron densities and exciton and trion emissions at the extreme of small densities. Controlling the piezoelectric field component perpendicular to the QW layers allows us to achieve the spatially indirect exciton luminescence in double quantum well structures.
机译：驻波压电场可用于改变GaAs / AlGaAs量子阱（QW）中的空间和时间电荷条件，为控制阱中的二维电子气（2DEG）密度提供了一种通用工具。 LiNbO_3压电谐振器向置于板表面附近的2DEG施加MHz频率的振荡压电场，其面内分量和垂直场分量的比率可控。这使我们能够动态地调整QW平面中的电荷状态并影响光致发光光谱。发现由于压电场的平面内分量，在QW平面中形成了耗尽和累积的电子密度的空间分布区域。然后，光致发光光谱在空间和时间上都发生变化，在大电子密度下表现出电子-空穴等离子体的复合，而在小密度下表现出激子和三重子的发射。控制垂直于QW层的压电场分量使我们能够在双量子阱结构中实现空间间接激子发光。

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