Possible Mechanisms of Electronic Phase Separation in Oxide Interfaces

  • LaAlO 3/SrTiO 3 and LaTiO 3/SrTiO 3 (LXO / STO) interfaces are known to host a strongly inhomogeneous (nearly) two-dimensional electron gas (2DEG). In this work, we present three unconventional electronic mechanisms of electronic phase separation (EPS) in a 2DEG as a possible source of inhomogeneity in oxide interfaces. Common to all three mechanisms is the dependence of some (interaction) potential on the 2DEGs density. We first consider a mechanism resulting from a sizable density-dependent Rashba spin-orbit coupling. Next, we point out that an EPS may also occur in the case of a density-dependent superconducting pairing interaction. Finally, we show that the confinement of the 2DEG to the interface by a density-dependent, self-consistent electrostatic potential can by itself cause an EPS.

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Author: Nicolo Bovenzi, Francesca Finocchiaro, Nicantro Scopigno, Daniel Bucheli, Sergio CapraraORCiD, Götz Seibold, Marco GrilliORCiD
URL:http://link.springer.com/article/10.1007/s10948-014-2903-7
DOI:https://doi.org/10.1007/s10948-014-2903-7
ISSN:1557-1939
ISSN:1557-1947
Title of the source (English):Journal of Superconductivity and Novel Magnetism
Document Type:Scientific journal article peer-reviewed
Language:English
Year of publication:2015
Tag:Electronic phase separation; Oxide interfaces; Superconductivity
Volume/Year:28
Issue number:4
First Page:1273
Last Page:1277
Faculty/Chair:Fakultät 1 MINT - Mathematik, Informatik, Physik, Elektro- und Informationstechnik / FG Computational Physics
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