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Single-layer CrI3 grown by molecular beam epitaxy.

Peigen Li1, Cong Wang2, Jihai Zhang1

  • 1School of Physics, Sun Yat-sen University, Guangzhou 510275, China.

Science Bulletin
|January 20, 2023
PubMed
Summary

Researchers directly grew single-layer chromium triiodide (CrI3) using molecular beam epitaxy. This 2D magnetic material

Keywords:
CrI(3)Molecular beam epitaxyScanning tunneling microscopyTwo-dimensional magnetic materials

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Science

Background:

  • Single- and few-layer chromium triiodide (CrI3) is a key material for 2D magnetism.
  • Mechanical exfoliation is the conventional method for its preparation.

Purpose of the Study:

  • To report the direct growth of single-layer CrI3 using molecular beam epitaxy (MBE).
  • To characterize the structure and properties of MBE-grown CrI3.

Main Methods:

  • Molecular beam epitaxy (MBE) in ultrahigh vacuum.
  • Scanning tunneling microscopy (STM) for surface imaging.
  • Density functional theory (DFT) calculations for theoretical analysis.

Main Results:

  • Successfully achieved direct growth of single-layer CrI3.
  • Identified iodine trimers as basic units of the topmost layer.
  • Observed different superstructures on Au(111) and graphite substrates.
  • Demonstrated decomposition into chromium diiodide at elevated temperatures.
  • Found spatial separation of unoccupied and occupied electronic states.

Conclusions:

  • MBE offers a viable route for controlled synthesis of single-layer CrI3.
  • Substrate choice significantly influences the resulting superstructure.
  • Understanding electronic states is crucial for exploring magnetic interactions in 2D CrI3.