Optical absorption of non-interacting tight-binding electrons in a Peierls-distorted chain at half band-filling

Optical absorption of non-interacting tight-binding electrons in a Peierls-distorted chain at half band-filling
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半带填充时 Peierls 扭曲链中非相互作用紧束缚电子的光吸收

DOI:
10.1080/13642819708205700
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发表时间:
1996
期刊:
Philosophical Magazine B-physics of Condensed Matter Statistical Mechanics Electronic Optical and Magnetic Properties
影响因子:
--
通讯作者:
S. Koch
S. Koch
中科院分区:
--
文献类型:
--
作者:
F. Gebhard;K. Bott;M. Scheidler;P. Thomas;S. Koch

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本文是关于半充满Peierls扭曲链中电子的光学吸收的三篇文章中的第一篇,我们给出了非相互作用紧束缚电子的分析结果。我们仔细地推导了具有带宽W和二聚化参数δ的余弦色散关系的电子的电流算符、偶极跃迁矩阵元和光学吸收的显式表达式。识别到当前操作员的新的校正(η)项。在Wδ<ω<W的频率范围内有一个宽的带间跃迁,它的形状由上、下Peierls子带的联合态密度和跃迁矩阵元的强动量依赖性决定。
Abstract In this, the first of three articles on the optical absorption of electrons in half-filled Peierls-distorted chains, we present analytical results for non-interacting tight-binding electrons. We carefully derive explicit expressions for the current operator, the dipole transition matrix elements and the optical absorption for electrons with a cosine dispersion relation of bandwidth W and dimerization parameter δ. New correction (η) terms to the current operator are identified. A broad band-to-band transition is found in the frequency range Wδ < ω < W whose shape is determined by the joint density of states for the upper and lower Peierls subbands and the strong momentum dependence of the transition matrix elements.
S. Matsubara:“4. 体内典型和非典型抗精神病药物对多巴胺 D-1、D-2 和血清素 2 受体的占用。”
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