Polarized spin transport in mesoscopic quantum rings with electron--phonon and Rashba spin--orbit coupling
Liu Ping(刘平)a)† and Xiong Shi-Jie(熊诗杰)b)
a Basic Department, The Jinling Institute of Technology, Nanjing 211169, China; b National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, China
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.
Received: 24 January 2009
Revised: 04 May 2009
Accepted manuscript online:
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10474033 and
60676056) and the State Key Projects of Basic Research of China
(Grant Nos 2006CB0L1000 and 2005CB623605).
Cite this article:
Liu Ping(刘平) and Xiong Shi-Jie(熊诗杰) Polarized spin transport in mesoscopic quantum rings with electron--phonon and Rashba spin--orbit coupling 2009 Chin. Phys. B 18 5414
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
