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Effect of superconducting correlation on the localization of quasiparticles in low dimensions | Tao Xiang
; | Date: |
29 Mar 1995 | Subject: | cond-mat | Affiliation: | Research Centre in Superconductivity, University of Cambridge, UK | Abstract: | Localization lengths of superconducting quasiparticles $lambda_s$ are evaluated and compared with the corresponding normal state values $lambda_n$ in one 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. | Source: | arXiv, cond-mat/9503152 | Other source: | [GID 630409] pmid9981844 | Services: | Forum | Review | PDF | Favorites |
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