Observation of a two-dimensional electron gas at CaTiO3 film surfaces

Steffan Muff,Mauro Fanciulli,Andrew P. Weber,Nicolas Pilet,Zoran Ristic,Zhiming Wang,Nicholas C. Plumb,M. Radovic,J. Hugo Dil

Applied Surface Science（2018）

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摘要

•Films of the parent perovskite CaTiO3 grown by PLD are studied with synchrotron ARPES and XPS.•The CaTiO3 surface hosts a 2DEG with a band bottom at 400meV with no indication of 3D dispersing bands.•The surface forms a c(4×2) reconstruction changing to p(2×2) under UV-light responsible for the presence of folded bands.

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关键词

Calciumtitanate,CaTiO3,Surface states,Two-dimensional electron gas,Electronic structure,ARPES,PLD

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