中国物理B ›› 2009, Vol. 18 ›› Issue (12): 5491-5495.doi: 10.1088/1674-1056/18/12/060

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Differential conductance in normal-metal/insulator/metal/d-wave superconductor junction carrying a supercurrent

李晓薇   

  1. Department of Physics, Huaiyin Teachers College, Huaian 223001, China;Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, Huaiyin Techers College, Huaian 223001, China
  • 收稿日期:2009-03-03 修回日期:2009-07-05 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:
    Project supported by the Natural Science Foundation of Jiangsu Provincial Education Commission of China (Grant No 06KJB140009).

Differential conductance in normal metal/insulator/metal/d-wave superconductor junction carrying a supercurrent

Li Xiao-Wei(李晓薇)†   

  1. Department of Physics, Huaiyin Teachers College, Huaian 223001, China;Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, Huaiyin Techers College, Huaian 223001, China
  • Received:2009-03-03 Revised:2009-07-05 Online:2009-12-20 Published:2009-12-20
  • Supported by:
    Project supported by the Natural Science Foundation of Jiangsu Provincial Education Commission of China (Grant No 06KJB140009).

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摘要： This paper applies the Bogoliubov--de Gennes equation and the Blonder--Tinkham--Klapwijk approach to study the oscillatory behaviour of differential conductance in a normal metal/insulator/metal/d-wave superconductor junction carrying a supercurrent Is. We find that (i) a three-humped structure appears at a nearly critical supercurrent Is and z ≈ 0.5 for the normal metal/insulator/metal/d_x2 + y2-wave superconductor junction; (ii) the zero-bias conductance peak splits into two peaks with sufficiently large applied current for the normal metal/insulator/metal/dxy-wave superconductor junction; (iii) the conductance spectrum exhibits oscillating behaviour with the bias voltage and the peaks of the resonances are suppressed by increasing supercurrent Is.

Abstract: This paper applies the Bogoliubov--de Gennes equation and the Blonder--Tinkham--Klapwijk approach to study the oscillatory behaviour of differential conductance in a normal metal/insulator/metal/d-wave superconductor junction carrying a supercurrent Is. We find that (i) a three-humped structure appears at a nearly critical supercurrent Is and z ≈ 0.5 for the normal metal/insulator/metal/d$_{x^2+u^2}$ -wave superconductor junction; (ii) the zero-bias conductance peak splits into two peaks with sufficiently large applied current for the normal metal/insulator/metal/dxy-wave superconductor junction; (iii) the conductance spectrum exhibits oscillating behaviour with the bias voltage and the peaks of the resonances are suppressed by increasing supercurrent Is.

Key words: d-wave superconductor, conductance, supercurrent

中图分类号:  (Tunneling phenomena; Josephson effects)

  • 74.50.+r
74.20.Rp (Pairing symmetries (other than s-wave)) 74.25.Sv (Critical currents)