Broadening of the Berezinskii-Kosterlitz-Thouless transition by correlated disorder

Article

关键词: SUPERCONDUCTOR-INSULATOR TRANSITION;    ANTIVORTEX PAIR DISSOCIATION;    2-DIMENSIONAL SUPERCONDUCTOR;    SUPERFLUID DENSITY;    PHASE FLUCTUATIONS;    CRITICAL-BEHAVIOR;    FILMS;    SYSTEMS;    SINGLE;    MODEL;   

DOI  :  10.1103/PhysRevB.96.060508

来源: SCIE

【 摘 要 】

The Berezinskii-Kosterlitz-Thouless (BKT) transition in two-dimensional superconductors is usually expected to be protected against disorder. However, its fingerprints in a real system, such as, e.g., the universal superfluid-density jump, are often at odds with this expectation. Here, we show that the disorder-induced granularity of the superconducting state modifies the nucleation mechanism for vortex-antivortex pairs. This leads to a considerable smearing of the universal superfluid-density jump as compared to the paradigmatic clean case, in agreement with experimental observations.

【 授权许可】

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