Sharpness of the Berezinskii-Kosterlitz-Thouless Transition in Disordered NbN Films.

Autor: Weitzel A; Institute for Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany., Pfaffinger L; Institute for Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany., Maccari I; Department of Physics, Stockholm University, SE-10691 Stockholm, Sweden., Kronfeldner K; Institute for Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany., Huber T; Institute for Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany., Fuchs L; Institute for Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany., Mallord J; Institute for Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany., Linzen S; Leibniz Institute of Photonic Technology, D-07745 Jena, Germany., Il'ichev E; Leibniz Institute of Photonic Technology, D-07745 Jena, Germany., Paradiso N; Institute for Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany., Strunk C; Institute for Experimental and Applied Physics, University of Regensburg, D-93040 Regensburg, Germany.
Jazyk: angličtina
Zdroj: Physical review letters [Phys Rev Lett] 2023 Nov 03; Vol. 131 (18), pp. 186002.
DOI: 10.1103/PhysRevLett.131.186002
Abstrakt: We present a comprehensive investigation of the Berezinskii-Kosterlitz-Thouless transition in ultrathin strongly disordered NbN films. Measurements of resistance, current-voltage characteristics, and kinetic inductance on the very same device reveal a consistent picture of a sharp unbinding transition of vortex-antivortex pairs that fit standard renormalization group theory without extra assumptions in terms of inhomogeneity. Our experiments demonstrate that the previously observed broadening of the transition is not an intrinsic feature of strongly disordered superconductors and provide a clean starting point for the study of dynamical effects at the Berezinskii-Kosterlitz-Thouless transition.
Databáze: MEDLINE