Excitonic behavior in self-assembled InAs/GaAs quantum rings in high magnetic fields

被引：24

作者：

Kleemans, N. A. J. M. ^{[1
]}

Blokland, J. H. ^{[2
]}

Taboada, A. G. ^{[3
]}

van Genuchten, H. C. M. ^{[1
]}

Bozkurt, M. ^{[1
]}

Fomin, V. M. ^{[1
,4
,5
]}

Gladilin, V. N. ^{[4
,5
]}

Granados, D. ^{[3
]}

Garcia, J. M. ^{[3
]}

Christianen, P. C. M. ^{[2
]}

Maan, J. C. ^{[2
]}

Devreese, J. T. ^{[1
,4
]}

Koenraad, P. M. ^{[1
]}

机构：

[1] Eindhoven Univ Technol, COBRA, PSN, NL-5600 MB Eindhoven, Netherlands

[2] Radboud Univ Nijmegen, IMM, HFML, NL-6525 ED Nijmegen, Netherlands

[3] Inst Microelect Madrid, CSIC, E-28760 Tres Cantos, Spain

[4] Univ Antwerp, TFVS, B-2020 Antwerp, Belgium

[5] Univ Stat Moldova, FSM, Kishinev, Moldova

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 15期

关键词：

DOTS; NANOSTRUCTURES; ELECTRON;

D O I：

10.1103/PhysRevB.80.155318

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the exciton energy level structure of a large ensemble of InAs/GaAs quantum rings by photoluminescence spectroscopy in magnetic fields up to 30 T for different excitation densities. The confinement of an electron and a hole in these type I quantum rings along with the Coulomb interaction suppress the excitonic Aharonov-Bohm effect. We show that the exciton energy levels are nonequidistant and split up in only two levels in magnetic field, reflecting the ringlike geometry. A model, based on realistic parameters of the self-assembled quantum rings, allows us to interpret the essential features of the observed PL spectra in terms of the calculated optical transition probabilities.

引用

页数：4

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