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 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.
- Authors:
-
[1];
- Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- 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:
- 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. https://doi.org/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. https://doi.org/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},
number = 1,
volume = 9,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2018},
month = {Mon Oct 01 00:00:00 EDT 2018}
}
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Figures / Tables:
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 »
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Stimulating Oxide Heterostructures: A Review on Controlling SrTiO 3 ‐Based Heterointerfaces with External Stimuli
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Figures / Tables found in this record:
Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.