Anisotropic two-dimensional electron gas at SrTiO_3(110)

Zhiming Wang; Zhicheng Zhong; Xianfeng HaoStefan GerholdBernhard St?gerMichael SchmidJaime Sánchez-BarrigaAndrei VarykhalovCesare FranchiniKarsten HeldUlrike Diebold

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Anisotropic two-dimensional electron gas at SrTiO_3(110)

机译：Anisotropic two-dimensional electron gas at SrTiO_3(110)

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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 SrTiO_3(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.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2014年第11期|3933-3937|共5页
作者
Zhiming Wang; Zhicheng Zhong; Xianfeng HaoStefan GerholdBernhard St?gerMichael SchmidJaime Sánchez-BarrigaAndrei VarykhalovCesare FranchiniKarsten HeldUlrike Diebold;
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作者单位

Helmholtz-Zentrum Berlin, BESSY-II, 12489 Berlin, Germany;

Faculty of Physics and Center for Computational Material Science, University of Vienna, 1090 Vienna, Austria;

Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, AustriaInstitute of Applied Physics, Vienna University of Technology, 1040 Vienna, Austria;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
electron; gases; oxide;

Anisotropic two-dimensional electron gas at SrTiO_3(110)

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