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Anisotropic two-dimensional electron gas at SrTiO3(110).

ABSTRACT: Two-dimensional electron gases (2DEGs) at oxide heterostructures are attracting considerable attention, as these might one day substitute conventional semiconductors at least for some functionalities. Here we present a minimal setup for such a 2DEG--the SrTiO3(110)-(4 × 1) surface, natively terminated with one monolayer of tetrahedrally coordinated titania. Oxygen vacancies induced by synchrotron radiation migrate underneath this overlayer; this leads to a confining potential and electron doping such that a 2DEG develops. Our angle-resolved photoemission spectroscopy and theoretical results show that confinement along (110) is strikingly different from the (001) crystal orientation. In particular, the quantized subbands show a surprising "semiheavy" band, in contrast with the analog in the bulk, and a high electronic anisotropy. This anisotropy and even the effective mass of the (110) 2DEG is tunable by doping, offering a high flexibility to engineer the properties of this system.

SUBMITTER: Wang Z 

PROVIDER: S-EPMC3964063 | biostudies-literature | 2014 Mar

REPOSITORIES: biostudies-literature

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Anisotropic two-dimensional electron gas at SrTiO3(110).

Wang Zhiming Z   Zhong Zhicheng Z   Hao Xianfeng X   Gerhold Stefan S   Stöger Bernhard B   Schmid Michael M   Sánchez-Barriga Jaime J   Varykhalov Andrei A   Franchini Cesare C   Held Karsten K   Diebold Ulrike U  

Proceedings of the National Academy of Sciences of the United States of America 20140303 11

Two-dimensional electron gases (2DEGs) at oxide heterostructures are attracting considerable attention, as these might one day substitute conventional semiconductors at least for some functionalities. Here we present a minimal setup for such a 2DEG--the SrTiO3(110)-(4 × 1) surface, natively terminated with one monolayer of tetrahedrally coordinated titania. Oxygen vacancies induced by synchrotron radiation migrate underneath this overlayer; this leads to a confining potential and electron doping  ...[more]

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