Browsing by Author "Yu, L"

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Electron spin filtering in all-semiconductor tunneling structures
(2003-09-01)
Yu, L
;
Huang, HC
;
Voskoboynikov, O
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
In this work we briefly review the present day perspectives for exploiting conventional nonmagnetic semiconductor nano-technology to design high speed spin-filter devices. In recent theoretical investigations a high spin polarization has been predicted for the ballistic tunneling current in semiconductor single- and double-barrier asymmetric tunnel structures of III-V semiconductors with strong Rashba spin-orbit coupling. We show in this paper that the polarization in the tunneling can probability be sufficiently increased for producing realistic single-barrier structures by including of the Dresselhaus term into consideration. (C) 2004 Published by Elsevier Ltd.
Time-resolved spin filtering in semiconductor symmetric resonant barrier structures
(2005-07-15)
Yu, L
;
Voskoboynikov, O
;
交大名義發表
;
National Chiao Tung University
Spin-dependent tunneling in semiconductor symmetric double barrier structures is studied theoretically. Our calculation is based on the effective one-band Hamiltonian and Dresselhaus spin-orbit coupling. We demonstrate that the ratio of the tunneling times of electrons with opposite spin orientations can vary over a few orders in magnitude. The large and tunable ratio of the tunneling times can serve as the basis in the development of all-semiconductor dynamic spin filters. (c) 2005 American Institute of Physics.