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arXiv · 1502.07561

Possible mechanisms of electronic phase separation in oxide interfaces

N. Bovenzi·F. Finocchiaro·N. Scopigno·D. Bucheli·S. Caprara·G. Seibold·M. Grilli
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Abstract

LaAlO3/SrTiO3 ad LaTiO3/SrTiO3 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 2DEG's 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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N. Bovenzi, F. Finocchiaro, N. Scopigno, D. Bucheli, S. Caprara, G. Seibold, M. Grilli. 2015-02-26. Possible mechanisms of electronic phase separation in oxide interfaces. https://doi.org/10.1007/s10948-014-2903-7

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