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Phys. Rev. B 62, 15323–15326 (2000)

Optical observation of the energy-momentum dispersion of spatially indirect excitons

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A. Parlangeli, P. C. M. Christianen, and J. C. Maan
Research Institute for Materials, High Field Magnet Laboratory, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands

I. V. Tokatly*
Lehrstuhl für Theoretische Festkörperphysik, Universität Erlangen-Nürnberg, Staudtstrasse 7/B2, 91054 Erlangen, Germany

C. B. Soerensen and P. E. Lindelof
Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark

Received 5 July 2000; published in the issue dated 15 December 2000

The center-of-mass (CM) dispersion of spatially indirect excitons (IE’s) in biased GaAs/Al0.35Ga0.65As double quantum wells is determined by photoluminescence (PL) spectroscopy in an in-plane magnetic field B. The field rigidly shifts the IE dispersion in k space by an amount proportional to both B and the electron-hole separation. The PL emission arises from IE’s with zero total momentum, corresponding to finite CM velocity, which allows the direct measurement of the IE CM dispersion. The observed PL energy increases quadratically in B, corresponding to the IE kinetic energy, whereas the PL intensity follows the thermal occupation of the optically active IE states and decreases as a Gaussian function of B.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.62.15323
DOI:
10.1103/PhysRevB.62.15323
PACS:
71.35.Ji, 73.20.Dx, 78.55.Cr

*On leave from Moscow Institute of Electronic Engineering, Zelenograd, 103498, Russia.

 
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