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Ultrafast Optical Control of Rashba Interactions in a TMDC Heterostructure.

Henry Mittenzwey1, Abhijeet M Kumar2, Raghav Dhingra2

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Summary
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We found that the Rashba effect in MoSe2/MoS2 heterostructures causes phonon-assisted spin relaxation in interlayer excitons. This spin mixing dominates above 70K, offering a new route for ultrafast spin manipulation.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Interlayer excitons in transition metal dichalcogenide heterostructures exhibit unique spin properties.
  • The Rashba effect, arising from broken inversion symmetry, significantly influences spin dynamics.

Purpose of the Study:

  • To investigate spin relaxation dynamics of interlayer excitons in MoSe2/MoS2 heterostructures.
  • To explore the role of the Rashba effect in phonon-assisted intravalley spin relaxation.

Main Methods:

  • Development of a theoretical microscopic approach to quantify Rashba interactions.
  • Experimental validation using time-resolved Kerr rotation measurements.

Main Results:

  • The Rashba effect induces phonon-assisted intravalley spin relaxation in interlayer excitons.
  • Rashba-induced spin mixing becomes the dominant spin relaxation pathway above 70 Kelvin.

Conclusions:

  • Identified a novel spin-depolarization channel in heterostructures.
  • This mechanism offers potential for ultrafast spin manipulation applications.