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EXPERIMENTAL STUDY ON THE SPIN-ORBIT COUPLING PROPERTY IN LOW-DIMENSIONAL SEMICONDUCTOR STRUCTURES

Abstract : We have studied the spin-orbit coupling and optical properties in several low-dimensional semiconductors structures. First, the spin dynamics in (001) GaAs/AlGaAs two-dimensional electron gas was investigated by time resolved Kerr rotation technique under a transverse magnetic field. The in-plane spin lifetime is found to be anisotropic. The results show that the electron density in two-dimensional electron gas channel strongly affects the Rashba spin-orbit coupling. Then, a large anisotropy of the magnitude of in-plane conduction electron g factor in asymmetric (001) GaAs/AlGaAs QWs was observed and its tendency of temperature dependence was studied. Second, the experimental study of the in-plane-orientation dependent spin splitting in the C(0001) GaN/AlGaN two-dimensional electron gas at room temperature was reported. The measurement of circular photogalvanic effect current clearly shows the isotropic in-plane spin splitting in this system for the first time. Third, the first measurement of conduction electron g factor in GaAsN at room temperature was done by using time resolved Kerr rotation technique. It demonstrates that the g factor can be modified drastically by introducing a small amount of nitrogen in GaAs bulk. Finally, the optical characteristic of indirect type II transition in a series of size and shape-controlled linear CdTe/CdSe/CdTe heterostructure nanorods was studied by steady-state and time resolved photoluminescence. Our results show the steady transfer from the direct optical transition (type I) within CdSe to the indirect transition (type II) between CdSe/CdTe a the length of the nanorods increases.
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https://tel.archives-ouvertes.fr/tel-00595906
Contributor : Hongming Zhao <>
Submitted on : Wednesday, May 25, 2011 - 6:24:34 PM
Last modification on : Wednesday, November 4, 2020 - 2:46:25 PM

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Hongming Zhao. EXPERIMENTAL STUDY ON THE SPIN-ORBIT COUPLING PROPERTY IN LOW-DIMENSIONAL SEMICONDUCTOR STRUCTURES. Condensed Matter [cond-mat]. Université de Grenoble, 2010. English. ⟨tel-00595906⟩

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