Transient Coherent Effects in Semiconductor Three-State Systems

The coherent response of a semiconductor three-state system to one or two intense light pulses is investigated experimentally on a 100 fs time scale. Three experiments constitute this dissertation: observation of excitonic Rabi oscillations, measurement of two-exciton coupled Stark shifting, and an...

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Bibliographic Details
Main Author: Donovan, Michael E
Format: Report
Language:English
Subjects:
Atomic and Molecular Physics and Spectroscopy
COHERENCE
DENSITY MATRIX ELEMENTS
EQUATIONS OF MOTION
EXCITONS
HAMILTONIAN FUNCTIONS
HARTREE FOCK APPROXIMATION
INDIUM GALLIUM ARSENIDES
LIGHT PULSES
OSCILLATION
QUANTUM WELLS
RABI OSCILLATION
SBE(SEMICONDUCTOR BLOCH EQUATIONS)
SEMICONDUCTORS
SPECTROSCOPY
STARK SHIFTING
THESES
THREE STATE SYSTEMS
TIME RESOLVED ULTRAFAST SEMICONDUCTOR SPECTROSCOPY
TRANSIENTS
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Summary:The coherent response of a semiconductor three-state system to one or two intense light pulses is investigated experimentally on a 100 fs time scale. Three experiments constitute this dissertation: observation of excitonic Rabi oscillations, measurement of two-exciton coupled Stark shifting, and an attempt to observe dark states. Basic concepts of time-resolved ultrafast semiconductor spectroscopy are explained, followed by an analysis of semiconductor two- and three-state systems. Pure two- and three-state dynamics are derived from first principles, followed by the development of the appropriate semiconductor Bloch equations (SBE). Two-color pump-probe, two-color pump-pump, and pump-pump-probe techniques are explained in the context of three-state semiconductor experiments. The experimental setup is explained in detail. Work performed under a research grant by ARO.