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DOI: 10.1209/epl/i1997-00505-4

Europhys. Lett, 40 (5), pp. 557-562 (1997)

Narrow-resonance states of 2D magnetic spin-exciton
in periodically modulated fields

Yu. A. Bychkov , T. Maniv , I. D. Vagner and P. Wyder

L. D. Landau Institute for Theoretical Physics - Kosygina 2, Moscow, Russia
High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung
Centre National de la Recherche Scientifique - BP 166, F-38042 Grenoble, Cedex 9, France
Department of Chemistry, Technion-Israel Institute of Technology - Haifa 32000, Israel
Solid State Institute, Technion-Israel Institute of Technology - Haifa 32000, Israel

(received 5 May 1997; accepted in final form 17 October 1997)

PACS. 73.50Jt - Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects).
PACS. 71.35 - Excitons and related phenomena.
PACS. 76.60 - Nuclear magnetic resonance and relaxation.

Abstract:

Two-dimensional electron gas (2DEG) under a strong perpendicular magnetic field in periodically modulated fields exhibits a peculiar discrete spectrum near the bottom of the spin-exciton band. The combined effect of the electrostatic modulation potential, and the e-h Coulomb attraction under the magnetic field, leads to nearly bound relative e-h oscillations perpendicular to the modulation axis, which have a characteristic Rydberg-like spectrum near the edge of the spin-exciton band. This low-lying, very narrow excitonic lines may significantly affect the spin and the charge transport in the thermally activated regime.

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