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Dimensionality transitions of exciton Fano resonance spectra in a semiconductor Wannier-Stark ladder

机译:半导体Wannier-Stark阶梯中激子Fano共振谱的量纲跃迁

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The dimensionality transition revealed by modulations of exciton Fano resonance (FR) spectra in a semiconductor WannierStark ladder with respect to an applied static electric field is traced by use of calculated spectra based on the multichannel scattering theory. With decreasing the bias, marked overlap resonance between adjacent FR profiles causes contrastive modulation patterns of the spectra in two distinct regions of a photon energy E below and above the Van Hove Mo critical point epsilon(MD) of the original superlattices. By coalescence of a great number of fine spectra with very narrow widths, the structured continuum spectra of the exciton FR in the region of E epsilon(MD)are transformed into a broad plateau. (c) 2005 Elsevier Ltd. All rights reserved.
机译:通过使用基于多通道散射理论的计算光谱来跟踪半导体WannierStark阶梯中的激子Fano共振(FR)光谱相对于施加的静电电场的调制所揭示的尺寸变化。随着偏置的减小,相邻FR轮廓之间明显的重叠共振会在原始超晶格的Van Hove Mo临界点epsilon(MD)之下和之上的光子能量E的两个不同区域中引起光谱的对比调制模式。通过大量宽度非常窄的精细光谱的合并,在E <ε(MD)区域中的激子FR的结构化连续谱被转换为纯束缚态的尖峰。另一方面,通过大量无结构连续体的合并,E>ε(MD)区域中的那些连续体转化为宽平台。 (c)2005 Elsevier Ltd.保留所有权利。

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