Phase Separation from Electron Confinement at Oxide Interfaces

Physical Review Letters
N ScopignoM Grilli

Abstract

Oxide heterostructures are of great interest for both fundamental and applicative reasons. In particular, the two-dimensional electron gas at the LaAlO_{3}/SrTiO_{3} or LaTiO_{3}/SrTiO_{3} interfaces displays many different properties and functionalities. However, there are clear experimental indications that the interface electronic state is strongly inhomogeneous and therefore it is crucial to investigate possible intrinsic mechanisms underlying this inhomogeneity. Here, the electrostatic potential confining the electron gas at the interface is calculated self-consistently, finding that such confinement may induce phase separation, to avoid a thermodynamically unstable state with a negative compressibility. This provides a robust mechanism for the inhomogeneous character of these interfaces.

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Citations

Jun 23, 2016·Advanced Materials·Lenart DudyRalph Claessen
Oct 21, 2016·Physical Chemistry Chemical Physics : PCCP·Hongli GuoJin Zhao
Aug 31, 2017·Reports on Progress in Physics·Yun-Yi PaiJeremy Levy
Feb 24, 2018·Nature Communications·Yu SaitoYoshihiro Iwasa
Apr 11, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·I I PiyanzinaT Kopp
Jan 25, 2020·Physical Review Letters·Chunhai YinJan Aarts
Mar 25, 2017·Physical Review Letters·A E M SminkH Hilgenkamp
Feb 10, 2021·Nanomaterials·Gyanendra SinghAlexei Kalaboukhov
Feb 10, 2018·Reports on Progress in Physics·Yun-Yi PaiJeremy Levy

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