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Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Quantum dots: Optical and transport properties

HL 39.7: Talk

Thursday, March 26, 2009, 11:15–11:30, BEY 81

Exciton storage in a nano-scale Aharonov-Bohm ring with electric field tuningAndrea M. Fischer1, Vivaldo L. Campo Jr.2, Mikhail E. Portnoi3, and •Rudolf A. Roemer11Department of Physics and Centre for Scientific Computing, University of Warwick, Coventry, CV4 7AL, UK — 2Departmento de Fisica, Universidade Federal de Sao Carlos-UFSCar, 13565-905 Sao Carlos, SP, Brazil — 3School of Physics, University of Exeter, Exeter EX4 4QL, UK

We study analytically the optical properties of a simple model for an electron-hole pair on a ring subjected to perpendicular magnetic flux and in-plane electric field [1]. We show how to tune this excitonic system from optically active to optically dark as a function of these external fields. Our results offer a simple mechanism for exciton storage and read-out.

[1] AM Fischer, VL Campo Jr, ME Portnoi, RA Roemer, arXiv:0809.3863

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