| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Shot Noise in Aharonov-Casher Rings |
LIN Liang-Zhong, ZHU Rui, DENG Wen-Ji |
| Department of Physics, South China University of Technology, Guangzhou 510640 |
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LIN Liang-Zhong, ZHU Rui, DENG Wen-Ji 2010 Chin. Phys. Lett. 27 067306 |
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Abstract We investigate the shot noise of electron transport through an Aharonov-Casher ring subject to the Rashba spin-orbit coupling (SOC). Analytic expressions for the coefficients of reflection and transmission are derived by using the Griffith boundary conditions. For this kind of SOC, the ballistic transport of electrons can be analyzed as two independent spin channels, and both of them have the same transmission and reflection coefficients. The dependences of shot noise and Landauer-Büttiker conductance on controllable factors, including the strength of Rashba SOC, the asymmetrical angle of lead-connection positions, the radius of the rings, and the wave vector (or energy) of the incident Fermi electrons, are explicitly described by some new combined parameters. The ways that the shot noise and conductance vary with Rashba SOC and with asymmetrical angle are demonstrated by numerical simulations, respectively. It is revealed that the shot noise reaches its maximum for the particular situation of half transmission and half reflection and zero shot noise occurs at conductance maxima.
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| Keywords:
73.23.-b
71.70.Ej
73.50.Td
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Received: 08 April 2010
Published: 25 May 2010
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| PACS: |
73.23.-b
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(Electronic transport in mesoscopic systems)
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71.70.Ej
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(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
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73.50.Td
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(Noise processes and phenomena)
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