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Quasiparticle localization in disordered d-wave superconductors

Zhu1, Sheng, Ting

  • 1Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204, USA.

Physical Review Letters
|December 2, 2000
PubMed
Summary
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Disorder in 2D d-wave superconductors creates a zero-energy peak in density of states, enhancing spin conductance. However, this peak does not cause delocalization, with quasiparticle states remaining localized.

Area of Science:

  • Condensed matter physics
  • Superconductivity
  • Quantum mechanics

Background:

  • D-wave superconductors exhibit complex behaviors under disorder.
  • Understanding disorder effects is crucial for predicting material properties.

Purpose of the Study:

  • To investigate the impact of random impurities on 2D d-wave superconductors.
  • To analyze the relationship between density of states, spin conductance, and quasiparticle localization.

Main Methods:

  • Extensive numerical simulations.
  • Analysis of density of states and spin conductance.
  • Examination of quasiparticle state localization.

Main Results:

  • A sharp resonant peak appears in the density of states at zero energy.

Related Experiment Videos

  • Finite-size spin conductance is significantly enhanced, leading to nonuniversal scaling.
  • Despite the peak, all quasiparticle states remain localized.

    • Conclusions:

    • The zero-energy resonant peak does not induce delocalization in these systems.
    • In the weak disorder limit, spin conductance approaches universal values for small sample sizes.