Time Resolved Nonlinear Optical Spectroscopy of Magnetically Confined Excitons
A perpendicular magnetic field confines the quasi-two-dimensional (2D) electronic states of a quantum well into quasi-zero-dimensional (0D) magneto-excitons. Short-pulse broadband optical studies demonstrate that at high field, a gas of magneto-excitons behaves like an ensemble of atomic two-level systems. Excitation of a nonthermal distribution of 2D carriers at zero field results in rapid relaxation to a thermal distribution; at high field, all low-energy scattering channels are eliminated, so that in 0D, relaxation rates decrease by several orders of magnitude relative to 2D. Magnetic confinement in quantum wells permits the study of the interactions and relaxation dynamics of electon-hole pairs, in materials of excellent optical quality, as their dimensionality is continuously tuned from 2D to 0D.
KeywordsPair State Excitonic State Resonant Excitation Nonlinear Optical Response Coulomb Correlation
Unable to display preview. Download preview PDF.
- 2.Miura N, Iwasa Y, Tarucha S, Okamoto H (1985) In: Chadi JD, Harrison WA (eds) Proc 17th int Conf on the physics of semiconductors. Springer, New YorkGoogle Scholar
- 6.Ossau W, Jäkel B, Bangert E (1987). In: Landwehr G (ed) High magnetic fields in semiconductor physics. Springer, BerlinGoogle Scholar
- 10.MacDonald AH, Ritchie DS (1985) Phys Rev B33: 8336Google Scholar
- 18.Stark JB (1991) Ph D thesis, Massachusetts Institute of TechnologyGoogle Scholar