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

Yu. A. Bychkov1,2, T. Maniv2,3,4, I. D. Vagner2,4 and P. Wyder2

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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.


PACS

71.35.-y Excitons and related phenomena

73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)

76.60.-k Nuclear magnetic resonance and relaxation

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 5 (1 December 1997)

Received 5 May 1997, accepted for publication 17 October 1997, in final form 17 October 1997



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