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Title: Origin of Two-Dimensional Electron Gases at Oxide Interfaces: Insights from Theory

The response of oxide thin films to polar discontinuities at interfaces and surfaces has generated enormous activity due to the variety of interesting effects that it gives rise to. A case in point is the discovery of the electron gas at the interface between LaAlO3 and SrTiO3, which has since been shown to be quasitwodimensional, switchable, magnetic and/or superconducting. Despite these findings, the origin of the twodimensional electron gas is highly debated and several possible mechanisms remain. Here we review the main proposed mechanisms and attempt to model expected effects in a quantitative way with the ambition of better constraining what effects can/cannot explain the observed phenomenology. We do it in the framework of a phenomenological model constructed to provide an understanding of the electronic and/or redox screening of the chemical charge in oxide heterostructures. We also discuss the effect of intermixing, both conserving and not conserving the total stoichiometry
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Univ. of Liege, (Belgium); Univ. of Cambridge (United Kingdom). Cavendish Lab.
  2. Univ. of Liege, (Belgium)
  3. Univ. of Cambridge (United Kingdom). Cavendish Lab.; Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, IL (United States)
  4. Univ. of Cambridge (United Kingdom). Cavendish Lab.; Basque Foundation for Science Ikerbasque (Spain); CIC nanoGUNE, San Sebastian (Spain)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 26; Journal Issue: 14; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
Engineering and Physical Sciences Research Council (EPSRC); USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1357168

Bristowe, N. C., Ghosez, Philippe, Littlewood, Peter B., and Artacho, E.. Origin of Two-Dimensional Electron Gases at Oxide Interfaces: Insights from Theory. United States: N. p., Web. doi:10.1088/0953-8984/26/14/143201.
Bristowe, N. C., Ghosez, Philippe, Littlewood, Peter B., & Artacho, E.. Origin of Two-Dimensional Electron Gases at Oxide Interfaces: Insights from Theory. United States. doi:10.1088/0953-8984/26/14/143201.
Bristowe, N. C., Ghosez, Philippe, Littlewood, Peter B., and Artacho, E.. 2014. "Origin of Two-Dimensional Electron Gases at Oxide Interfaces: Insights from Theory". United States. doi:10.1088/0953-8984/26/14/143201. https://www.osti.gov/servlets/purl/1357168.
@article{osti_1357168,
title = {Origin of Two-Dimensional Electron Gases at Oxide Interfaces: Insights from Theory},
author = {Bristowe, N. C. and Ghosez, Philippe and Littlewood, Peter B. and Artacho, E.},
abstractNote = {The response of oxide thin films to polar discontinuities at interfaces and surfaces has generated enormous activity due to the variety of interesting effects that it gives rise to. A case in point is the discovery of the electron gas at the interface between LaAlO3 and SrTiO3, which has since been shown to be quasitwodimensional, switchable, magnetic and/or superconducting. Despite these findings, the origin of the twodimensional electron gas is highly debated and several possible mechanisms remain. Here we review the main proposed mechanisms and attempt to model expected effects in a quantitative way with the ambition of better constraining what effects can/cannot explain the observed phenomenology. We do it in the framework of a phenomenological model constructed to provide an understanding of the electronic and/or redox screening of the chemical charge in oxide heterostructures. We also discuss the effect of intermixing, both conserving and not conserving the total stoichiometry},
doi = {10.1088/0953-8984/26/14/143201},
journal = {Journal of Physics. Condensed Matter},
number = 14,
volume = 26,
place = {United States},
year = {2014},
month = {3}
}