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首页> 外文期刊>Physical review >Exact two-body quantum dynamics of an electron-hole pair in semiconductor coupled quantum wells: A time-dependent approach
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Exact two-body quantum dynamics of an electron-hole pair in semiconductor coupled quantum wells: A time-dependent approach

机译：半导体耦合量子阱中电子-空穴对的精确两体量子动力学：时变方法

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摘要

We simulate the time-dependent coherent dynamics of a spatially indirect exciton-an electron-hole pair with the two particles confined in different layers-in a GaAs coupled quantum well system. We use a unitary wave-packet propagation method taking into account in full the four degrees of freedom of the two particles in a two-dimensional system, including both the long-range Coulomb attraction and arbitrary two-dimensional electrostatic potentials affecting the electron and/or the hole separately. The method has been implemented for massively parallel architectures to cope with the huge numerical problem, showing good scaling properties and allowing evolution for tens of picoseconds. We have investigated both transient time phenomena and asymptotic time transmission and reflection coefficients for potential profiles consisting of (ⅰ) extended barriers and wells and (ⅱ) a single-slit geometry. We found clear signatures of the internal two-body dynamics, with transient phenomena in the picosecond time scale which might be revealed by optical spectroscopy. Exact results have been compared with mean-field approaches which, neglecting dynamical correlations by construction, turn out to be inadequate to describe the electron-hole pair evolution in realistic experimental conditions.
机译：我们在GaAs耦合量子阱系统中模拟了空间间接激子的时间相关相干动力学-电子-空穴对，两个电子粒子被限制在不同的层中。我们使用单一波包传播方法，充分考虑了二维系统中两个粒子的四个自由度，包括远程库仑引力和影响电子和/的任意二维静电势或孔分开。该方法已针对大规模并行体系结构实施，以解决巨大的数值问题，显示出良好的缩放特性，并允许演化数十皮秒。我们已经研究了由（phenomena）扩展的势垒和阱以及（for）单缝几何构成的潜在剖面的瞬态时间现象以及渐近时间传输和反射系数。我们发现了内部两体动力学的清晰特征，在皮秒级的瞬态现象可能通过光谱学揭示出来。精确的结果已与均场方法进行了比较，均值方法忽略了构造的动力学相关性，结果不足以描述实际实验条件下的电子-空穴对演化。

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  • 来源
    《Physical review》 |2016年第19期|195310.1-195310.11|共11页
  • 作者

    Federico Grasselli; Andrea Bertoni; Guido Goldoni;

  • 作者单位

    Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Universita degli Studi di Modena e Reggio Emilia, Via Campi 213/a, Modena, Italy,S3, Consiglio Nazionale delle Ricerche, Istituto Nanoscienze, Via Campi 213/a, Modena, Italy;

    S3, Consiglio Nazionale delle Ricerche, Istituto Nanoscienze, Via Campi 213/a, Modena, Italy;

    Dipartimento di Scienze Fisiche, Informatiche e Matematiche, Universita degli Studi di Modena e Reggio Emilia, Via Campi 213/a, Modena, Italy,S3, Consiglio Nazionale delle Ricerche, Istituto Nanoscienze, Via Campi 213/a, Modena, Italy;

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