Topological insulator Sb$_{2}$Te$_{3}$ thin films grown by MBE

ORAL

Abstract

Atomically flat Sb$_{2}$Te$_{3}$ thin films were grown by molecular beam epitaxy (MBE) on Si(111) substrate. Layer-by-layer growth was characterized by real time reflection high-energy electron diffraction (RHEED) intensity oscillations. \textit{In situ }angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy (STM) measurements reveal that the as-grown films are stoichiometric Sb$_{2}$Te$_{3}$. When the thickness is larger than two quintuple layers, the films show the predicted topological property with a single Dirac-cone on the surface. The measured band structure for the films with a thickness from one to five quintuple layers agrees well with our first principle calculations.

*The work is supported by NSFC and the National Basic Research Program from MOST of China.

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Authors

  • Jin-Feng Jia

    • Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, Beijing 100084, P. R. China

  • Guang Wang

    • Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, Beijing 100084, P. R. China

  • Xie-Gang Zhu

    • Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, Beijing 100084, P. R. China

  • Yao-Yi Li

    • Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, Beijing 100084, P. R. China

  • Jing Wen

    • Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, Beijing 100084, P. R. China

  • Ke He

    • Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics.CAS.China
    • Institute of Physics, The Chinese Academy of Sciences, Beijing 100190, P. R. China

  • Lili Wang

    • Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics.CAS.China
    • Institute of Physics, The Chinese Academy of Sciences, Beijing 100190, P. R. China

  • Xucun Ma

    • Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics.CAS.China
    • Institute of Physics, The Chinese Academy of Sciences, Beijing 100190, P. R. China

  • Hai-Jun Zhang

    • Institute of Physics, The Chinese Academy of Sciences, Beijing 100190, P. R. China

  • Zhong Fang

    • The Institute of Physics, Chinese Academy of Sciences P.O. Box 603, Beijing 100190, China
    • Institute of Physics, Chinese Academy of Sciences
    • Institute of Physics, The Chinese Academy of Sciences, Beijing 100190, P. R. China

  • Qi-Kun Xue

    • Tsinghua University
    • Tsinghua University.China
    • Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, Beijing 100084, P. R. China