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Title: Nature of superconductor-insulator transition at LaAlO{sub 3}/SrTiO{sub 3} interface

The two-dimensional electron liquid, at the interface between two band insulators LaAlO{sub 3} and SrTiO{sub 3}, exhibits novel, unconventional superconductivity below 200 mK. One of the remarkable properties of the two-dimensional superconductor is its fantastic tunability by external parameters such as gate-voltage or magnetic field. We study the superconductor to insulator transition induced by gate-voltage by employing a self-consistent, mean-field Bogoliubov-de Gennes treatment based on an effective model. We show that the non-monotonic behaviour of the superconductivity with respect to gate-voltage is intrinsically due to the Rashba spin-orbit coupling. With increasing gate-voltage both the electron concentration and Rashba spin-orbit splitting increases. Elevated electron filling boosts superconductivity whereas enhanced spin-orbit splitting annihilates electron-pairing. The non-monotonicity is a result of this competition. The device application of the superconductor-insulator transition in this interface is discussed.
Authors:
 [1] ;  [1] ;  [2]
  1. Department of Physics, Indian Institute of Technology Kharagpur, W. B. 721302 (India)
  2. (India)
Publication Date:
OSTI Identifier:
22391731
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1661; Journal Issue: 1; Conference: ICCMP 2014: International Conference on Condensed Matter Physics 2014, Shimla (India), 4-6 Nov 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINATES; CONCENTRATION RATIO; ELECTRIC POTENTIAL; ELECTRONS; INTERFACES; LANTHANUM COMPOUNDS; L-S COUPLING; MAGNETIC FIELDS; MEAN-FIELD THEORY; SPIN; STRONTIUM TITANATES; SUPERCONDUCTIVITY; SUPERCONDUCTORS