EFFECT OF SUPERCONDUCTING CORRELATION ON THE LOCALIZATION OF QUASI-PARTICLES IN LOW DIMENSIONS

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关键词: QUANTUM DIFFUSION;    SCALING THEORY;    2 DIMENSIONS;    ABSENCE;   

DOI  :  10.1103/PhysRevB.52.6204

来源: SCIE

【 摘 要 】

Localization lengths of superconducting quasiparticles lambda(s) are evaluated and compared with the corresponding normal-state values lambda(n) in one-dimensional (1D) and two-dimensional lattices. The effect of superconducting correlation on the localization of quasiparticles is generally stronger in an off-site pairing state than in an on-site pairing state. The modification of superconducting correlation to lambda is strongly correlated with the density of states (DOS) of superconducting quasiparticles. lambda(s) drops within the energy gap but is largely enhanced around energies where DOS peaks appear. For a gapless pairing state in 1D or a d-wave pairing state in 2D, lambda(s)/lambda(n) at the Fermi energy E(F) is of order 1 and determined purely by the value of gap parameter not by the random potential. For the d-wave pairing state, the localization effect is largely weakened compared with the corresponding normal state and quasiparticles with energies close to E(F) are more strongly localized than other low-energy quasiparticles.

【 授权许可】

Free