Regensburg 2007 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 13: Poster 1

HL 13.57: Poster

Monday, March 26, 2007, 15:00–17:30, Poster A

Excitonic Aharonov-Bohm effect in the presence of an electric field — •Andrea Fischer and Rudolf Römer — Department of Physics and Centre for Scientific Computing, University of Warwick, Coventry CV4 7AL, UK

We theoretically study exciton absorption on a ring threaded by a magnetic flux and in the presence of a lateral electric field. For the case when the attraction between an electron and a hole is short ranged, we use a self-consistent Ansatz to obtain a solution to the problem. We demonstrate that despite the electrical neutrality of the exciton, for a fixed electric field, both the spectral position of the exciton peak in the absorption and the corresponding oscillator strength oscillate with magnetic flux. We show that for a fixed magnetic flux, the amplitude of oscillation first increases slightly but later decreases strongly with increasing electric field.