Carrier density and disorder tuned superconductor-metal transition in a two-dimensional electron system

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

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

Quantum ground states that arise at atomically controlled oxide interfaces provide an opportunity to address key questions in condensed matter physics, including the nature of two-dimensional metallic behaviour often observed adjacent to superconductivity. At the superconducting LaAlO3/SrTiO3 interface, a metallic ground state emerges upon the collapse of superconductivity with field-effect gating and is accompanied with a pseudogap. Here we utilize independent control of carrier density and disorder of the interfacial superconductor using dual electrostatic gates, 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 two-dimensional 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
Article number4008
JournalNature communications
Volume9
Issue number1
DOIs
Publication statusPublished - 2018 Dec 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Carrier density and disorder tuned superconductor-metal transition in a two-dimensional electron system'. Together they form a unique fingerprint.

Cite this