Molecular Beam Epitaxy Growth and Scanning Tunneling Microscopy Study of Pyrite CuSe2 Films on SrTiO3
PENG Jun-Ping1, ZHANG Hui-Min1, SONG Can-Li2,3, JIANG Ye-Ping1,2, WANG Li-Li2,3, HE Ke2,3, XUE Qi-Kun2,3, MA Xu-Cun1,2,3**
1State Key Laboratory for Surface Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 2State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084 3Collaborative Innovation Center of Quantum Matter, Beijing 100084
Abstract：We perform molecular beam epitaxy growth and scanning tunneling microscopy study of copper diselenide (CuSe2) films on SrTiO3(001). Using a Se-rich condition, the single-phase pyrite CuSe2 grows in the Stranski–Krastanov (layer-plus-island) mode with a preferential orientation of (111). Our careful inspection of both the as-grown and post-annealed CuSe2 films at various temperatures invariably shows a Cu-terminated surface, which, depending on the annealing temperature, reconstructs into two distinct structures 2×√3 and √3×√3-R30°. The Cu termination is supported by the depressed density of states near the Fermi level, measured by in-situ low temperature scanning tunneling spectroscopy. Our study helps understand the preparation and surface chemistry of transition metal pyrite dichalcogenides thin films.
. [J]. 中国物理快报, 2015, 32(06): 68104-068104.
PENG Jun-Ping, ZHANG Hui-Min, SONG Can-Li, JIANG Ye-Ping, WANG Li-Li, HE Ke, XUE Qi-Kun, MA Xu-Cun. Molecular Beam Epitaxy Growth and Scanning Tunneling Microscopy Study of Pyrite CuSe2 Films on SrTiO3. Chin. Phys. Lett., 2015, 32(06): 68104-068104.
2015, Vol. 32 
