Exchange enhancement of a spin-polarized 2D electron gas determined by optical-absorption spectroscopy
- 4 September 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 63 (10), 1102-1105
- https://doi.org/10.1103/physrevlett.63.1102
Abstract
A large exchange enhancement of the spin-splitting of a two-dimensional electron gas in GaAs has been determined from optical spectroscopy. When the Fermi energy is located between the spin-split electron states (ν=1), we observe a striking temperature dependence in the optical absorption of interband transitions associated with both spin levels. The absorption intensity of the transitions monitors the occupations of the spin-split levels. Analysis of the temperature dependence reveals an exchange enhancement of the electron g factor of ≊9. .AEKeywords
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