Large band offset as driving force of 2-dimensional electron confinement: the case of SrTiO${}_3$/SrZrO${}_3$ interface

Abstract

Using advanced first-principles calculations we predict that the non-polar SrTiO${}_3$/SrZrO${}_3$ (001) interface, designed as either thin SrZrO${}_3$ film deposited on SrTiO${}_3$ or short-period (SrTiO${}_3$)${}_m$/(SrZrO${}_3$)${}_n$ superlattice, host a 2-dimensionally confined electron gas. Mobile electron charge due to native impurities, field-effect, or modulation doping remains tightly trapped at the interface. Key ingredients for this occurrence are a) the peculiar chemistry of 3d orbitals, b) the large band offset at titanate-zirconate interface.

7 pages, 5 figures

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• Large phonon-drag enhancement induced by narrow quantum confinement at the LaAlO3/SrTiO3 interface
• Subband structure of two-dimensional electron gases in SrTiO3