Atomic properties of monoclinic Ag2Se thin film grown on SrTiO3substrate by molecular beam epitaxy

Samira Daneshmandi, Yanfeng Lyu, Taha Salavati-Fard, Hanming Yuan, Moein Adnani, Lars C. Grabow, Ching Wu Chu

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1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)4140-4147
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume12
Issue number17
DOIs
Publication statusPublished - 2021 May 6

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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