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:
影响因子:
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通讯作者:
S. Koch
中科院分区:
文献类型:
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作者:
F. Gebhard;K. Bott;M. Scheidler;P. Thomas;S. Koch
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.
DOI:
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发表时间:
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期刊:
影响因子:
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作者:
通讯作者:
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