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The magnetic proximity effect at the MoS2/CrI3interface.

Zhi-Bo Yin1, Xiao-Yan Chen1, Yun-Peng Wang1

  • 1School of Physics and Electronics, Hunan Key Laboratory for Super-Micro Structure and Ultrafast Process, Central South University, 932 South Lushan Road, Changsha, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|October 1, 2021
PubMed
Summary

Magnetic proximity effects in MoS2/CrI3 heterostructures enable significant valley splitting. Vertical electric fields induce large, discontinuous changes in valley splitting through orbital hybridization.

Keywords:
2D magnetsfirst-principles calculationmagnetic proximity effectvalleytronics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Two-dimensional magnetic materials offer a route to break valley degeneracy in transition-metal dichalcogenides via the magnetic proximity effect.
  • Understanding interfacial effects in van der Waals heterostructures is crucial for novel electronic and spintronic applications.

Purpose of the Study:

  • To investigate the band structure of MoS2/CrI3 van der Waals heterostructures.
  • To explore the manipulation of valley splitting using vertical electric fields.
  • To analyze the role of interlayer orbital hybridization in modulating magnetic proximity effects.

Main Methods:

  • First-principles calculations were employed to simulate the electronic band structure.
  • The MoS2/CrI3 van der Waals heterostructure was modeled.
  • The impact of varying vertical electric fields and interlayer distances was systematically studied.

Main Results:

  • A substantial valley splitting of approximately 19.60 meV was achieved with an electric field of 0.115 V/Å, equivalent to 89.0 T.
  • Electric fields induced discontinuous changes in valley splitting due to band crossings and interlayer orbital hybridization.
  • Interlayer distance significantly influences the electric field's modulation of valley splitting.

Conclusions:

  • Vertical electric fields can effectively control and induce large valley splitting in MoS2/CrI3 heterostructures.
  • Interlayer orbital hybridization plays a key role in the observed electric field-driven phenomena.
  • This research enhances the understanding of interfacial magnetic proximity effects in van der Waals heterostructures.