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Anomalous variation of the exciton Fano-resonance spectra in strongly biased Wannier-Stark ladder

机译：强偏置Wannier-Stark阶梯中激子Fano共振谱的异常变化

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摘要

Effects of the Wannier-Stark ladder (WSL) resonance on optical absorption spectra in strongly biased superlattices are theoretically investigated by solving the multichannel scattering problem relevant to the WSL-exciton Fano-resonance. When the bias of an electric field F is applied such that a WSL subband state is energetically aligned with adjacent ones, resulting in strong repulsion (anticrossing) due to Zener resonance, an onset of exciton absorption notably shifts toward the lower energy side. However. just a slight change of F away from the anticrossing leads to a peculiar suppression, lowering the absorption edge. According to a qualitative analytic model, such an anomalous variance is found ascribable to delocalization of WSL subband wave functions across several periods through a mixing of an exciton reduced mass in the region of the potential well with that in the region of the potential barrier. (C) 2004 Published by Elsevier Ltd.
机译：理论上，通过解决与WSL激子法诺共振有关的多通道散射问题，研究了Wannier-Stark阶梯共振（WSL）对强偏置超晶格中光吸收光谱的影响。当施加电场F的偏压以使WSL子带状态与相邻的状态能量对准时，由于齐纳共振而导致强烈的排斥力（反交叉），激子吸收的开始会显着移向能量较低的一侧。然而。 F距反交叉点的微小变化会导致特殊的抑制，从而降低吸收边缘。根据定性分析模型，发现这种异常方差可归因于WSL子带波函数在数个周期内通过在势阱区域中的激子质量下降与势垒区域中的质量下降混合而离域。 （C）2004由Elsevier Ltd.出版

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