| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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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
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| Cite this article: |
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PENG Jun-Ping, ZHANG Hui-Min, SONG Can-Li et al 2015 Chin. Phys. Lett. 32 068104 |
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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.
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Received: 20 April 2015
Published: 30 June 2015
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| PACS: |
81.15.Hi
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(Molecular, atomic, ion, and chemical beam epitaxy)
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68.37.Ef
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(Scanning tunneling microscopy (including chemistry induced with STM))
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68.55.-a
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(Thin film structure and morphology)
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