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

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 LaAlO 3/SrTiO 3 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. In conclusion, the gate-tuned superconductor–metal transitions are driven by macroscopic phase fluctuations of Josephson coupled superconducting puddles.

Authors:
ORCiD logo [1];  [1];  [2];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  2. Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1490640
Grant/Contract Number:  
AC02-76SF00515; GBMF4415; DMR-1157490
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Chen, Zhuoyu, Swartz, Adrian G., Yoon, Hyeok, Inoue, Hisashi, Merz, Tyler A., Lu, Di, Xie, Yanwu, Yuan, Hongtao, Hikita, Yasuyuki, Raghu, Srinivas, and Hwang, Harold Y. Carrier density and disorder tuned superconductor-metal transition in a two-dimensional electron system. United States: N. p., 2018. Web. doi:10.1038/s41467-018-06444-2.
Chen, Zhuoyu, Swartz, Adrian G., Yoon, Hyeok, Inoue, Hisashi, Merz, Tyler A., Lu, Di, Xie, Yanwu, Yuan, Hongtao, Hikita, Yasuyuki, Raghu, Srinivas, & Hwang, Harold Y. Carrier density and disorder tuned superconductor-metal transition in a two-dimensional electron system. United States. doi:10.1038/s41467-018-06444-2.
Chen, Zhuoyu, Swartz, Adrian G., Yoon, Hyeok, Inoue, Hisashi, Merz, Tyler A., Lu, Di, Xie, Yanwu, Yuan, Hongtao, Hikita, Yasuyuki, Raghu, Srinivas, and Hwang, Harold Y. Mon . "Carrier density and disorder tuned superconductor-metal transition in a two-dimensional electron system". United States. doi:10.1038/s41467-018-06444-2. https://www.osti.gov/servlets/purl/1490640.
@article{osti_1490640,
title = {Carrier density and disorder tuned superconductor-metal transition in a two-dimensional electron system},
author = {Chen, Zhuoyu and Swartz, Adrian G. and Yoon, Hyeok and Inoue, Hisashi and Merz, Tyler A. and Lu, Di and Xie, Yanwu and Yuan, Hongtao and Hikita, Yasuyuki and Raghu, Srinivas and Hwang, Harold Y.},
abstractNote = {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. In conclusion, the gate-tuned superconductor–metal transitions are driven by macroscopic phase fluctuations of Josephson coupled superconducting puddles.},
doi = {10.1038/s41467-018-06444-2},
journal = {Nature Communications},
issn = {2041-1723},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 7 works
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Figures / Tables:

Fig. 1 Fig. 1 : Operation of the dual-gate device. a The dual-gate device is formed by applying a Au electrode on top of the eight unit-cell epitaxial LaAlO3 layer and a Ag electrode from the back of the SrTiO3 substrate with 0.5 mm thickness. The channel width is 400 μm withmore » Hall bars patterned by predeposited AlOx hard mask. b, c Schematic diagram of the dual-gate operation for top- and back-gates, respectively. The thin lines represent the electron envelope wavefunction perpendicular to the interface at different gate voltages colour-matched to the thick solid lines, which represent the corresponding confinement potential. d, e Top- and back-gate modulation of carrier density (circles) and Hall mobility (squares) at T = 600 mK. The straight solid black lines are linear fits to the circles. The red and blue curves are estimates of mobility based on the measured sheet resistivity and fitted extrapolation of Hall density. The ranges of the solid lines correspond to the experimentally accessible tuning ranges« less

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Works referenced in this record:

Why some interfaces cannot be sharp
journal, January 2006

  • Nakagawa, Naoyuki; Hwang, Harold Y.; Muller, David A.
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Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
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Tunable Rashba Spin-Orbit Interaction at Oxide Interfaces
journal, March 2010


    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.