APS Logo

Manifestation of the multiband nature in the BCS-BEC crossover of FeSe<sub>1-<i>x</i></sub>S<i><sub>x</sub></i>

ORAL

Abstract

The crossover from the superconductivity of Bardeen-Cooper-Shrieffer (BCS) regime to Bose-Einstein condensation (BEC) regime holds the key to understanding the nature of pairing and condensation of fermions [1]. In electron systems in solids, however, it is generally difficult to control the paring strength of the electrons, and complete evidence of the BCS-BEC crossover has been elusive so far. Here, we provide the first example of complete evidence for the BCS-BEC crossover in an iron-based superconductor FeSe1-xSx from laser-excited angle-resolved photoemission spectroscopy, and propose a multiband mechanism for BCS-BEC crossover in this system.

[1] M. Randeria et al., Annu. Rev. Cond. Matt. Phys. 5, 209-232 (2014).

–

Presenters

  • Takahiro Hashimoto

    Institute for Solid State Physics, University of Tokyo

Authors

  • Takahiro Hashimoto

    Institute for Solid State Physics, University of Tokyo

  • Yuichi Ota

    Institute for Solid State Physics, University of Tokyo

  • Akihiro Tsuzuki

    Institute for Solid State Physics, University of Tokyo

  • Tsubaki Nagashima

    Institute for Solid State Physics, University of Tokyo

  • Akiko Fukushima

    Institute for Solid State Physics, University of Tokyo

  • Shigeru Kasahara

    Department of Physics, Kyoto University, Dept. Phys., Kyoto Univ., Kyoto Univ, Physics, Kyoto University, Kyoto University

  • Yuji Matsuda

    Department of Physics, Kyoto University, Department of Physics, Kyoto Univ, Dept. Phys., Kyoto Univ., Kyoto Univ, Physics, Kyoto University, Kyoto University

  • Kohei Matsuura

    Univ of Tokyo, Department of Advanced Materials Science, University of Tokyo, Department of Advanced Materials Science, The University of Tokyo, Univ of Tokyo-Kashiwanoha

  • Yuta Mizukami

    Department of Advanced Materials Science, University of Tokyo

  • Takasada Shibauchi

    Advanced Materials Science, University of Tokyo, Univ of Tokyo-Kashiwanoha, Department of Advanced Materials Science, University of Tokyo, Univ of Tokyo, Dept. Adv. Mat. Sci., Univ. Tokyo, Univ. of Tokyo, Department of Advanced Materials Science, The University of Tokyo, Department of Advanced Material Science, University of Tokyo

  • Shik Shin

    Univ of Tokyo, University of Tokyo, Institute for Solid State Physics, University of Tokyo, Univ of Tokyo-Kashiwanoha, Institute for Solid State Physics, The University of Tokyo

  • Kozo Okazaki

    Institute for Solid State Physics, University of Tokyo, Univ of Tokyo-Kashiwanoha