Optical response in a quantum dot superlattice nanoring under a lateral electric field

doi:10.1103/PhysRevB.72.165310

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	Optical response in a quantum dot superlattice nanoring under a lateral electric field
	Zhang, TY ; Zhao, W ; Cao, JC ; Zhang TY(张同意)
作者部门	瞬态光学国家重点实验室
	2005-10-01
发表期刊	PHYSICAL REVIEW B
ISSN	1098-0121
卷号	72 期号:16 页码:165310
摘要	The optical absorption of a GaAs/AlGaAs quantum dot superlattice nanoring (QDSLNR) under a lateral dc electric field and with magnetic flux threading the ring is investigated. This structure and configuration provides a unique opportunity to study the optical response of a superlattice under an inhomogeneous electric field, which is not easily realized for general quantum well superlattices (QWSLs) but naturally realized for QDSLNRs under a homogeneous lateral electric field. It has been shown that a lateral dc electric field gives rise to a substantial change of the optical absorption spectra. Under a low field, the excitonic optical absorption is dominated by a 1s exciton. And with the electric field increasing, the optical absorption undergoes a transition from 1s excitonic absorption to 0 excitronic WSL absorption. (The number of 0, and -1 and +1 below are WSLs index.) The -1 and the +1 WSLs corresponding to the maximum effective field can also be identified. Due to the inhomogeneity of the electric field, the peaks of the -1 and the +1 WSLs are diminished and between them there exist rich and complicated structures. This is in contrast to the general QWSLs under a homogenous electric field. The complicated structures can be understood by considering the inhomogeneity of the electric field along the ring, which results in the nearest-neighbor transition, the next-nearest-neighbor transition, etc., have a different value repectively, at different sites along the ring. This may give rise to multiple WSLs. We have also shown that the line shape of the optical absorption is not sensitive to the threading magnetic flux. The threading magnetic flux only gives rise to a slight diamagnetic shift. Thus the enhancement of the sensitivity to the flux allowing for observation of the excitonic Aharanov-Bohm effect in the plain nanoring is not expected in QDSLNRs.
文章类型	Article
学科领域	物理学
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1103/PhysRevB.72.165310
收录类别	SCI
关键词[WOS]	SEMICONDUCTOR SUPERLATTICES ; NUMERICAL-CALCULATION ; FRANZ-KELDYSH ; ABSORPTION ; EXCITON ; LOCALIZATION ; NANOWIRES ; GROWTH ; RINGS
语种	英语
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
WOS记录号	WOS:000232934900059
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.opt.ac.cn/handle/181661/7294
专题	瞬态光学研究室
通讯作者	Zhang TY(张同意)
作者单位	1.Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710068, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China
推荐引用方式 GB/T 7714	Zhang, TY,Zhao, W,Cao, JC,et al. Optical response in a quantum dot superlattice nanoring under a lateral electric field[J]. PHYSICAL REVIEW B,2005,72(16):165310.
APA	Zhang, TY,Zhao, W,Cao, JC,&张同意.(2005).Optical response in a quantum dot superlattice nanoring under a lateral electric field.PHYSICAL REVIEW B,72(16),165310.
MLA	Zhang, TY,et al."Optical response in a quantum dot superlattice nanoring under a lateral electric field".PHYSICAL REVIEW B 72.16(2005):165310.

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