Spin-dependent electron transport of a waveguide with Rashba spin--orbit coupling in an electromagnetic field |
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| Authors: | Xiao Xian-Bo Li Xiao-Mao and Chen Yu-Guang |
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| Affiliation: | Department of Physics, Tongji University, Shanghai 200092, China; College of Science, Jiangxi Agricultural University, Nanchang 330045, China |
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| Abstract: | We investigate theoretically the spin-dependent electron
transport in a straight waveguide with Rashba spin--orbit coupling
(SOC) under the irradiation of a transversely polarized
electromagnetic (EM) field. Spin-dependent electron conductance and
spin polarization are calculated as functions of the emitting
energy of electrons or the strength of the EM field by adopting the mode
matching approach. It is shown that the spin polarization can be
manipulated by external parameters when the strength of Rashba
SOC is strong. Furthermore, a sharp step structure is found to exist
in the total electron conductance. These results can be understood
by the nontrivial Rashba subbands intermixing and the electron
intersubband transition when a finite-range transversely polarized
EM field irradiates a straight waveguide. |
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| Keywords: | waveguide spin--orbit coupling spin
polarization |
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