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

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Chinese Physics B 2009年第12期18卷 5491-5495页

作者：李晓薇 department of Physics Huaiyin Teachers College Jiangsu Key Laboratory for Chemistry of Low-dimensional Materials Huaiyin Techers College

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/dx^2＋y^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.

关键词： d-wave superconductor conductance supercurrent

Tunneling Conductance in Quantum-Wire/Ferromagnetic-Insulator/d-wave superconductor Junction

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Communications in Theoretical Physics 2008年第5期49卷 1345-1348页

作者： LI Xiao-Wei department of Physics Huaiyin Teachers College Hunian 223001 China

We have studied the quasiparticle transport in quantum-wire /ferromagnetic-insulator/d wave super- conductor Junction （q/FI/d） in the framework of the Blonder-Tinkham-Klapwijk model. We calculate the tunneling conductance in q/FI/d as a function of the bias voltage at zero temperature and finite temperature based on Bogoliubov- de Gennes equations. different from the case in normal-metal/insulator/d wave superconductor Junctions, the zero-bias conductance peaks vanish for the single-mode case. The tunneling conductance spectra depend on the magnitude of the exchange interaction at the ferromagnetic-insulator.

关键词： quantum wire ferromagnetic insulator d-wave superconductor tunneling conductance

Josephson Current in superconductor-Ferromagnet／Insulator／d-wave superconductor Junctions

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Communications in Theoretical Physics 2005年第3期43卷 551-555页

作者： LIXiao-Wei dONGZheng-Chao departmentofPhysics HuaiyinTeachersCollegeHuaian223001China

Solving the Bogoliubov-de Gennes equation, the energy levels of bound statesare obtained in the ferromagnetic superconductor. The Josephson currents in a ferromagneticsuperconductor/Insulator/d-wave superconductor junction are calculated as a function of the exchangefield, temperature, and insulating barrier strength. It is found that the Josephson criticalcurrent is always suppressed by the presence of exchange Geld h and depends on crystalline axisorientation of d-wave superconductor.

关键词： ferromagnetic superconductor d-wave superconductor FS/I/d junctionJosephson current