Zeeman effects on the coherent tunnelling conductance in normal-metal/superconductor/normal-metal double tunnel junctions
Dong Zheng-Chao (董正超)
Department of Physics, Huaiyin Teachers College,Huaian 223001,China;Jiangsu Province Key Laboratory for Chemistry of Low-Dimensional Materials,Huaian 223001,China
Abstract The coherent quantum transport is investigated in normal-metal/superconductor/normal-metal(N/S/N) double tunnel junctions under a Zeeman magnetic field on the S.Taking simultaneously into account the electron-injected current from one Nelectrode and the hole-injected current from the other Nelectrode,we derive a general formulafor the differential conductance in the N/S/N system.It is shown that the conductance spectrum exhibits oscillatory behaviour with the bias voltage, and the oscillation amplitude is reduced wiht increasing temperature and Zeeman magneti field, the Zeeman energy can lead to the Zeeman splitting of conductance peaks.In the tunnel limit, a series of bound states of quasiparticles will form in the S.
Received: 18 November 2004
Revised: 24 February 2005
Accepted manuscript online:
PACS:
74.45.+c
(Proximity effects; Andreev reflection; SN and SNS junctions)
Fund: Project supported by the Postdoctoral Research Fonds of Jiangsu Province, and the "33"Project Funds of Jiangsu Province, China
Cite this article:
Dong Zheng-Chao (董正超) Zeeman effects on the coherent tunnelling conductance in normal-metal/superconductor/normal-metal double tunnel junctions 2005 Chinese Physics 14 1209
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