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首页> 外文期刊>Physical review letters >Subband Structure of a Two-Dimensional Electron Gas Formed at the Polar Surface of the Strong Spin-Orbit Perovskite KTaO_3
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Subband Structure of a Two-Dimensional Electron Gas Formed at the Polar Surface of the Strong Spin-Orbit Perovskite KTaO_3

机译：强自旋轨道钙钛矿KTaO_3极性表面形成的二维电子气的子带结构。

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摘要

We demonstrate the formation of a two-dimensional electron gas (2DEG) at the (100) surface of the 5d transition-metal oxide KTaO_3. From angle-resolved photoemission, we find that quantum confinement lifts the orbital degeneracy of the bulk band structure and leads to a 2DEG composed of ladders of subband states of both light and heavy carriers. Despite the strong spin-orbit coupling, our measurements provide a direct upper bound for the potential Rashba spin splitting of only △K ~ 0.02 A~(-1) at the Fermi level. The polar nature of the KTaO_3(100) surface appears to help mediate the formation of the 2DEG as compared to nonpolar SrTiO_3(100).
机译：我们演示了在5d过渡金属氧化物KTaO_3的（100）表面形成二维电子气（2DEG）。从角度分辨的光发射中，我们发现量子约束提升了体带结构的轨道简并性，并导致了由轻载子和重载子带状态的阶梯组成的2DEG。尽管自旋轨道耦合很强，但我们的测量提供了费米能级仅△K〜0.02 A〜（-1）的潜在Rashba自旋分裂的直接上限。与非极性SrTiO_3（100）相比，KTaO_3（100）表面的极性性质似乎有助于介导2DEG的形成。

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  • 来源
    《Physical review letters》 |2012年第11期|p.117602.1-117602.5|共5页
  • 作者

    P. D. C. King; R. H. He; T. Eknapakul; P. Buaphet; S.-K. Mo; Y. Kaneko; S. Harashima; Y. Hikita; M. S. Bahramy; C. Bell; Z. Hussain; Y. Tokura; Z.-X. Shen; H. Y. Hwang; F. Baumberger; W. Meevasana;

  • 作者单位

    SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KYI6 9SS, United Kingdom;

    Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA;

    School of Physics, Suranaree University of Technology and Synchrotron Light Research Institute,Nakhon Ratchasima, 30000, Thailand;

    School of Physics, Suranaree University of Technology and Synchrotron Light Research Institute,Nakhon Ratchasima, 30000, Thailand;

    Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA;

    Multiferroics Project, ERATO, JST, Tokyo 113-8656, Japan;

    Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan;

    Departments of Physics and Applied Physics, Stanford University, California 94305, USA,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, California 94025, USA;

    Correlated Electron Research Group (CERG), RIKEN-ASI, Wako 351-0918, Japan;

    Departments of Physics and Applied Physics, Stanford University, California 94305, USA,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, California 94025, USA;

    Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, California 94720, USA;

    Multiferroics Project, ERATO, JST, Tokyo 113-8656, Japan,Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan,Correlated Electron Research Group (CERG), RIKEN-ASI, Wako 351-0918, Japan;

    Departments of Physics and Applied Physics, Stanford University, California 94305, USA,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, California 94025, USA;

    Departments of Physics and Applied Physics, Stanford University, California 94305, USA,Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory,2575 Sand Hill Road, California 94025, USA,Correlated Electron Research Group (CERG), RIKEN-ASI, Wako 351-0918, Japan;

    SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews, Fife KYI6 9SS, United Kingdom;

    School of Physics, Suranaree University of Technology and Synchrotron Light Research Institute,Nakhon Ratchasima, 30000, Thailand,Thailand Center of Excellence in Physics, CHE, Bangkok, 10400, Thailand;

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  • 正文语种 eng
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  • 关键词

    clean metal, semiconductor, and insulator surfaces; electron states at surfaces and interfaces; quantum wells;

    机译：清洁金属;半导体和绝缘体表面;表面和界面的电子态;量子阱;

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