Gate-controlled BCS-BEC crossover in a two-dimensional superconductor

Author:

Nakagawa Yuji12ORCID,Kasahara Yuichi3,Nomoto Takuya1ORCID,Arita Ryotaro14ORCID,Nojima Tsutomu5ORCID,Iwasa Yoshihiro124ORCID

Affiliation:

1. Department of Applied Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan.

2. Quantum-Phase Electronics Center, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan.

3. Department of Physics, Kyoto University, Kitashirakawa Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.

4. RIKEN Center for Emergent Matter Science, Hirosawa 2-1, Wako, Saitama 351-0198, Japan.

5. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-0812, Japan.

Abstract

Inducing a crossover In conventional superconductors, the electron pairs responsible for superconductivity are large and overlapping. Starting from this so-called Bardeen-Cooper-Schrieffer (BCS) limit, increasing interactions can set the system on a path of crossover to the opposite limit of small, tightly bound electron pairs that undergo Bose-Einstein condensation (BEC). Nakagawa et al. intercalated lithium ions into the insulating material zirconium nitride chloride, varying the carrier density across a large range (see the Perspective by Randeria). This induced superconductivity and enabled the system to enter the crossover regime between the BCS and BEC limits. Science , this issue p. 190 ; see also p. 132

Funder

Japan Society for the Promotion of Science

A3 Foresight Program

Materials Education program for the future leaders in Research, Industry, and Technology

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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