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Electrically and mechanically tunable Rashba splitting in SbSeI Janus layer: a density functional theory study.

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SbSeI Janus layers exhibit strong Rashba spin splitting, enabling spin control via electric fields for spintronics. Mechanical strain and electric fields effectively tune this spin splitting, highlighting SbSeI as a promising material for advanced electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Two-dimensional (2D) materials are crucial for next-generation spintronic devices.
  • Rashba-like spin splitting near the Fermi level in 2D materials enables spin control.
  • SbSeI Janus layers are investigated for their potential in spintronics.

Purpose of the Study:

  • To investigate the Rashba spin splitting in SbSeI Janus layers using first-principles calculations.
  • To explore the influence of external stimuli like electric fields and mechanical strain on Rashba splitting.
  • To understand the atomic-scale mechanisms governing Rashba characteristics in SbSeI.

Main Methods:

  • Density functional theory (DFT) based calculations were employed.
  • The effects of spin-orbit coupling and broken mirror symmetry were analyzed.
  • Modulation of Rashba parameters under mechanical strain and electric fields was studied.

Main Results:

  • Strong Rashba spin splitting was observed in the conduction states of SbSeI Janus layers.
  • The Rashba splitting was found to be tunable via external electric fields and mechanical strain.
  • Strain robustness and electric field sensitivity of Rashba parameters were quantified.
  • Microscopic insights into the modulation of Rashba characteristics were provided.

Conclusions:

  • SbSeI Janus layers exhibit significant Rashba spin splitting, controllable by external stimuli.
  • These findings position SbSeI as a promising material for future spintronic applications.
  • The study provides a fundamental understanding of spin-orbit coupling in 2D materials.