Atomic Properties of Monoclinic Ag2Se Thin Film Grown on SrTiO3 Substrate by Molecular Beam Epitaxy
| Autor: | Hanming Yuan, Lars C. Grabow, Samira Daneshmandi, Ching-Wu Chu, Moein Adnani, T. Salavati-fard, Yanfeng Lyu |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Fermi level 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology 01 natural sciences law.invention symbols.namesake Atomic properties Chemical physics law 0103 physical sciences symbols General Materials Science Physical and Theoretical Chemistry Thin film Scanning tunneling microscope 010306 general physics 0210 nano-technology Spectroscopy Molecular beam epitaxy Monoclinic crystal system |
| Zdroj: | The Journal of Physical Chemistry Letters. 12:4140-4147 |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.1c01016 |
| Popis: | Silver chalcogenides have attracted a great deal of interest due to their promise for exhibiting novel topological properties. Using scanning tunneling microscopy/spectroscopy (STM/S), we have characterized the atomic structure and electronic properties of a monoclinic Ag2Se thin film, similar to β-Ag2Te, grown on a SrTiO3 (STO)(001) substrate by molecular beam epitaxy (MBE). Three different types of Ag2Se atomic terminations are observed on the surface: (i) homogeneous hexagonal-like, (ii) rough mixed, and (iii) flat zigzag-striped structures. Structural analysis indicates that the different atomic terminations stem from different growth directions, which can be attributed to the lattice mismatch between the substrate and the Ag2Se film. STS analysis of these atomic terminations uncovers different features near the Fermi level, indicating constituent- and direction-dependent electronic properties. This Letter presents a practical method to grow monoclinic thin film Ag2Se and provides insight into its physical properties. |
| Databáze: | OpenAIRE |
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