Collective excitations in coupled quantum wells

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	Collective excitations in coupled quantum wells
	Yu JX ; Xia JB
刊名	solid state communications
	1996
卷号	99 期号:6 页码:433-438
关键词	semiconductors quantum wells dielectric response electron-electron interactions SUPERLATTICES
ISSN号	0038-1098
通讯作者	yu jx natl lab superlattices & microstruct pob 912 beijing 100083 peoples r china.
中文摘要	the dielectric response of a modulated three-dimensional electron system composed of a periodic array of quantum wells with weak coupling and strong coupling are studied, and the dispersions of the collective excitations and the single particle excitations as functions of wave vectors are given. it is found that for the nearly isolated multiple-quantum-well case with several subbands occupation, there is a three-dimensional-like plasmon when q(z)=0 (q(z) is the wave-vector component in the superlattice axis). there also exist intersubband collective excitations in addition to one intra-subband mode when q(z) not equal 0. the intra-subband mode has a linear dispersion relation with q(//) (the wave-vector component perpendicular to the superlattice axis) when q(//) is small. the inter-subband modes cover wider ranges in q(//) with increasing values of q(z). the energies of inter-subband collective excitations are close by the corresponding inter-subband single-particle excitation spectra. the collective excitation dispersions show obvious anisotropy in the 2d quantum limit. the calculated results agree with the experiment. the coupling between quantum wells affects markedly both the collective excitations and the single particle excitations spectra. the system shows gradually a near-three-dimensional electron gas character with increasing coupling. copyright (c) 1996 published by elsevier science ltd
学科主题	半导体物理
收录类别	SCI
语种	英语
公开日期	2010-11-17
内容类型	期刊论文
源URL	[http://ir.semi.ac.cn/handle/172111/15105]
专题	半导体研究所_中国科学院半导体研究所（2009年前）
推荐引用方式 GB/T 7714	Yu JX,Xia JB. Collective excitations in coupled quantum wells[J]. solid state communications,1996,99(6):433-438.
APA	Yu JX,&Xia JB.(1996).Collective excitations in coupled quantum wells.solid state communications,99(6),433-438.
MLA	Yu JX,et al."Collective excitations in coupled quantum wells".solid state communications 99.6(1996):433-438.