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arXiv 1504.04550cond-mat.mes-hall
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GaAs/AlGaAs核-多壳纳米线电子集体激发非弹性光散射谱的预测

Prediction of inelastic light scattering spectra from electronic collective excitations in GaAs/AlGaAs core-multishell nanowires

Miquel Royo, Andrea Bertoni, Guido Goldoni

摘要:

我们预测了嵌入核-多壳层GaAs/AlGaAs纳米线中的同轴量子阱中电子集体激发的非弹性光散射谱。详细分析了典型样品的复杂组成、六方截面和远距离掺杂,并利用密度泛函方法得到了自由电子气。非弹性光散射截面由于电荷和自旋集体激发属于准一维和准二维状态,共存于这样的径向异质结构,预测在非共振近似从一个完全三维多子带TDDFT形式主义。我们发现,集体激发可以分为方位角,径向和纵向激发,根据相关的密度波动,我们建议,他们的字符可以暴露沿异质结构的不同平面的非弹性光散射的特定光谱色散。

英文摘要:

We predict inelastic light scattering spectra from electron collective excitations in a coaxial quantum well embedded in a core-multishell GaAs/AlGaAs nanowire. The complex composition, the hexagonal cross section and the remote doping of typical samples are explicitly included, and the free electron gas is obtained by a DFT approach. Inelastic light scattering cross sections due to charge and spin collective excitations belonging to quasi-1D and quasi-2D states, which coexist in such radial heterostructures, are predicted in the non-resonant approximation from a fully three-dimensional multi-subband TDDFT formalism. We show that collective excitations can be classified in azimuthal, radial and longitudinal excitations, according to the associated density fluctuations, and we suggest that their character can be exposed by specific spectral dispersion of inelastic light scattering along different planes of the heterostructure.

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