Narrow-resonance states of 2D magnetic spin-exciton in periodically modulated fields
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.
EPL (Europhysics Letters)
- Pub Date:
- December 1997
- Galvanomagnetic and other magnetotransport effects;
- Excitons and related phenomena;
- Nuclear magnetic resonance and relaxation