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Observation of magnetically induced effective-mass enhancement of quasi-2D excitons
L V Butov1, C W Lai, D S Chemla
1Materials Sciences Division, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Physical Review Letters
|December 12, 2001
Abstract:
We present the first measurements of the dispersion relation of a quasi-2D magnetoexciton. We demonstrate that the magnetoexciton effective mass is determined by the coupling between the center-of-mass motion and internal structure and becomes overwhelmingly larger than the sum of the electron and hole masses in high magnetic fields.