Type of Document Dissertation Author Frazier, Matthew Allen URN etd-09102010-175624 Title Probe of Coherent and Quantum States in Narrow-Gap Based Semiconductors in the Presence of Strong Spin-Orbit Coupling Degree PhD Department Physics Advisory Committee
Advisor Name Title Khodaparast, Giti A. Committee Chair Heflin, James R. Committee Member Heremans, Jean J. Committee Member Kulkarni, Rahul V. Committee Member Keywords
- Circular photo-galvanic effect
- Magneto-optical Kerr effect
- Spin polarized current
- Narrow gap semiconductors
Date of Defense 2010-09-03 Availability unrestricted AbstractThe goal of this project was to study some unexplored optical and magneto-optical properties
of the newest member of III-V ferromagnetic structures, InMnSb, as well as InSb films
and InSb/AlInSb quantum wells. The emphasis was on dynamical aspects such as charge
and spin dynamics in order to address several important issues of the spin-related phenomena.
The objectives in this project were to: 1) understand charge/spin dynamics in NGS
with different confinement potentials, 2) study phenomena such as interband photo-galvanic
effects, in order to generate spin polarized current, 3) probe the effect of magnetic impurities
on the spin/charge dynamics. This thesis describes three experiments: detection and
measurement of spin polarized photocurrents in InSb films and quantum wells arising from
the circular photogalvanic effect, and measurements of the carrier and spin relaxation in
InSb and InMnSb structures by magneto-optical Kerr effect and differential transmission.
The samples for our studies have been provided by Prof. Heremans at Virginia Tech, Prof.
Santos at the University of Oklahoma, and Prof. Furdyna at the University of Notre Dame.
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