The density and disorder tuned superconductor-metal transition in two dimensions

Zhuoyu Chen, Adrian G. Swartz, Hyeok Yoon, Hisashi Inoue, Tyler Merz, Di Lu, Yanwu Xie, Hongtao Yuan, Yasuyuki Hikita, Srinivas Raghu, Harold Y. Hwang

Research output: Contribution to journalArticlepeer-review

Abstract

Quantum ground states which arise at atomically controlled oxide interfaces provide an opportunity to address key questions in condensed matter physics, including the nature of two-dimensional (2D) metallic behaviour often observed adjacent to superconductivity1-8. At the superconducting LaAlO3/SrTiO3interface9,10, a metallic ground state emerges upon the collapse of superconductivity with field-effect gating11,12. Strikingly, such metallicity is accompanied with a pseudogap13. Here, we utilize independent control of carrier density and disorder of the interfacial superconductor using dual electrostatic gates14, which enables the comprehensive examination of the electronic phase diagram approaching zero temperature. We find that the pseudogap corresponds to precursor pairing, and the onset of long-range phase coherence forms a 2D superconducting dome as a function of the dual gate voltages. The gate-tuned superconductor-metal transitions are driven by macroscopic phase fluctuations of Josephson coupled superconducting puddles.

Original languageEnglish
JournalUnknown Journal
Publication statusPublished - 2018 Jul 22

ASJC Scopus subject areas

  • General

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