Ultrafast magnetoexciton dynamics in GaAs
- Univ. of California, Berkeley, CA (United States). Dept. of Physics
A bulk semiconductor provides an excellent system for optically studying the ultrafast dynamics of Coulomb correlated magnetoexcitons. The applications of magnetic field to a 3-D system quantizes the energy levels of states with momentum perpendicular to B and, in contradistinction to experiments performed on 2-D quantum well systems, leaves a 1-D continuum of states with momentum parallel to B. The presence of the continuum states has a dramatic influence on both the linear and nonlinear optical properties. Thus, the experiments described blow track the evolution of the semiconductor from a 3-D to a 1-D system and reveal surprising optical properties not observed in the previously reported studies in quantum wells. Using ultrashort pulsed wave mixing spectroscopy, the authors investigate coherent emission from magnetoexcitons in GaAs. By spectrally resolving the emission, they relate the non periodic beat observed temporally to quantum interferences, which they attribute to Coulomb interactions between magnetoexcitons. Contrary to experiments in quantum wells, these interactions persist for fields strengths up to 10T.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10180261
- Report Number(s):
- LBL--35207; CONF-9405219--3; ON: DE94018175
- Country of Publication:
- United States
- Language:
- English
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