Differential conductance in normal metal/insulator/metal/d-wave superconductor junction carrying a supercurrent
Li Xiao-Wei(李晓薇)†
Department of Physics, Huaiyin Teachers College, Huaian 223001, China;Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, Huaiyin Techers College, Huaian 223001, China
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.
Received: 03 March 2009
Revised: 05 July 2009
Accepted manuscript online:
Fund: Project supported by the Natural
Science Foundation of Jiangsu Provincial Education Commission of
China (Grant No 06KJB140009).
Cite this article:
Li Xiao-Wei(李晓薇) Differential conductance in normal metal/insulator/metal/d-wave superconductor junction carrying a supercurrent 2009 Chin. Phys. B 18 5491
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