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 tuning — Andrea M. Fischer1, Vivaldo L. Campo Jr.2, Mikhail E. Portnoi3, and •Rudolf A. Roemer1 — 1Department 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