Metallic ground state in an ion-gated two-dimensional superconductor

Yu Saito, Yuichi Kasahara, Jianting Ye, Yoshihiro Iwasa, Tsutomu Nojima

Research output: Contribution to journalArticlepeer-review

222 Citations (Scopus)


Recently emerging two-dimensional (2D) superconductors in atomically thin layers and at heterogeneous interfaces are attracting growing interest in condensed matter physics. Here, we report that an ion-gated zirconium nitride chloride surface, exhibiting a dome-shaped phase diagram with a maximum critical temperature of 14.8 kelvin, behaves as a superconductor persisting to the 2D limit. The superconducting thickness estimated from the upper critical fields is ≅ 1.8 nanometers, which is thinner than one unit-cell. The majority of the vortex phase diagram down to 2 kelvin is occupied by a metallic state with a finite resistance, owing to the quantum creep of vortices caused by extremely weak pinning and disorder. Our findings highlight the potential of electric-field-induced superconductivity, establishing a new platform for accessing quantum phases in clean 2D superconductors.

Original languageEnglish
Pages (from-to)409-413
Number of pages5
Issue number6259
Publication statusPublished - 2015 Oct 23


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