Two-Dimensional Electron Gas at the N-type Interface of the LaAlO3/SrTiO3 Hetero-Structure: A First Principle Study

We examine the formation of the two-dimensional electron gas (2-DEG) at the n-type interface of two band insulators LaAlO3 (LAO) and SrTiO3 (STO) by increasing the thickness of the LAO layers in the framework of the density functional theory (DFT). It has been shown that a metal-insulator phase tran...

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Bibliographic Details
Published inJournal of physics. Conference series Vol. 537; no. 1
Main Authors Nam, T V, Duy, P B, Bach, G H
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.01.2014
Subjects
Conduction bands
Density functional theory
Electron gas
Electrons
First principles
Insulators
Phase transitions
Physics
Strontium titanates
Substrates
Thickness
Valence band
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Summary:We examine the formation of the two-dimensional electron gas (2-DEG) at the n-type interface of two band insulators LaAlO3 (LAO) and SrTiO3 (STO) by increasing the thickness of the LAO layers in the framework of the density functional theory (DFT). It has been shown that a metal-insulator phase transition occurs in the 2-DEG when the LAO layers reach to a critical thickness dc = 4 monolayers. The increase of the LAO layers enhances the LAO potential so that electrons can transfer from the LAO valence band to the STO conduction band, which confines conducting electrons only in the STO substrate.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/537/1/012007