4.7 Article

Topological crystalline insulator PbxSn1-xTe thin films on SrTiO3 (001) with tunable Fermi levels

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APL MATERIALS
卷 2, 期 5, 页码 -

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AMER INST PHYSICS
DOI: 10.1063/1.4876637

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  1. NSFC [11025419, 51331006]
  2. MOST [2011CB921904, 2011CB921901]

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In this letter, we report a systematic study of topological crystalline insulator PbxSn1-xTe (0 < x < 1) thin films grown by molecular beam epitaxy on SrTiO3(001). Two domains of PbxSn1-xTe thin films with intersecting angle of alpha approximate to 45 degrees. were confirmed by reflection high energy diffraction, scanning tunneling microscopy, and angle-resolved photoemission spectroscopy (ARPES). ARPES study of PbxSn-1Te thin films demonstrated that the Fermi level of PbTe could be tuned by altering the temperature of substrate whereas SnTe cannot. An M-shaped valance band structure was observed only in SnTe but PbTe is in a topological trivial state with a large gap. In addition, co-evaporation of SnTe and PbTe results in an equivalent variation of Pb concentration as well as the Fermi level of PbxSn1-xTe thin films. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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