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Session B17 - DCMP: QUANTUM WIRES I
mixed session, Monday morning, March 20, 11:00
Room C3, San Jose Convention Center
We have obtained time-resolved photoluminescence spectra as a function of applied magnetic field from a variety of strain confined structures. This measurement reveals excited states that are not resolved under continuous excitation. With the field oriented perpendicular to the well, we expect a transition from strain to magnetic confinement when the lateral size of the strain-confined state (which is of the same order as the exciton Bohr radius) equals the cyclotron radius of the electron. When this condition is met, the relatively field-independent sublevels in the quantum wires and dots transform into strongly field-dependent Landau levels. It has been predicted that this transition also enhances the rate of exciton relaxation by phonon emission. ^1 We present evidence for these effects. ^* Work done while at Bellcore ^ Present address: NASA Lewis Research Center, Cleveland OH ^ Present address: University of Exeter, England ^1 U. Bockelmann, Phys. Rev. Abstracts 25, 58 (1994)
