Polarized spin transport in mesoscopic quantum rings with electron--phonon and Rashba spin--orbit coupling |
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| Authors: | Liu Ping and Xiong Shi-Jie |
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| Affiliation: | Basic Department, The Jinling Institute of Technology, Nanjing 211169,
China; National Laboratory of Solid State Microstructures and Department of
Physics, Nanjing University, Nanjing 210093, China |
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| Abstract: | The influence of electron--phonon (EP) scattering on spin
polarization of current output from a mesoscopic ring with Rashba
spin--orbit (SO) interaction is numerically investigated. There are
three leads connecting to the ring at different positions;
unpolarized current is injected to one of them, and the other two
are output channels with different bias voltages. The spin
polarization of current in the outgoing leads shows oscillations as a
function of EP coupling strength owing to the quantum interference
of EP states in the ring region. As temperature increases, the
oscillations are evidently suppressed, implying decoherence of
the EP states. The simulation shows that the magnitude of polarized
current is sensitive to the location of the lead. The polarized
current depends on the connecting position of the lead in a
complicated way due to the spin-sensitive quantum interference
effects caused by different phases accumulated by transmitting
electrons with opposite spin states along different paths. |
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| Keywords: | electron--phonon scattering Rashba spin--orbit coupling mesoscopic ring spin polarized transport |
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