Weak-Localization Effect on the Density of States in Disordered d-wave Superconductors

The weak-localization effect on the quasiparticle density of states (DOS) is studied with the diagrammatic technique in the binary-alloy model of disordered two-dimensional d-wave superconductors both in the Born and the unitary limits. We derive in details the expressions of the Goldstone modes (cooperon and diffuson) for quasiparticle diffuson. For generic Fermi surfaces, the DOS is shown to be subject to a quantum interference correction of logarithmic suppression. In the combined limit of unitarity and nested Fermi surface (the UN limit), it is found that the self-energy diagrams with two π-mode diffusons make additional contributions to the weak-localization effect, which has not been considered in the previous diagrammatic analysis. Due to the contributions of these new diagrams, the DOS in the UN limit is shown to have also a negative logarithmic correction, which is qualitatively different from the previous prediction.

作 者： YANG Yong-hong GU Yu WANG Yong-Gang LIU Mei   作者單位： YANG Yong-hong(Department of Physics, Southeast University, Nanjing 210096, China;National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008, China)

GU Yu,WANG Yong-Gang,LIU Mei(Department of Physics, Southeast University, Nanjing 210096, China) 

刊 名： 理論物理通訊（英文版）  ISTIC SCI 英文刊名： COMMUNICATIONS IN THEORETICAL PHYSICS  年，卷(期)： 2004 42(8)  分類號： O4  關(guān)鍵詞： weak localization   d-wave superconductor   density of states  

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