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Optospintronics in Graphene via Proximity Coupling.

Ahmet Avsar1, Dmitrii Unuchek1, Jiawei Liu2

  • 1Electrical Engineering Institute and Institute of Materials Science and Engineering, École Polytechnique Fédérale de Lausanne (EPFL) , Lausanne CH 1015, Switzerland.

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|October 26, 2017
PubMed
Summary

We demonstrate a novel method for optical spin injection into graphene using WSe2 monolayers, enabling long-distance spin transport for spintronics. This overcomes limitations of previous methods, paving the way for advanced electronic devices.

Keywords:
graphenespin injectionspintronicstwo-dimensional materialsvalleytronics

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Area of Science:

  • Spintronics
  • Materials Science
  • Condensed Matter Physics

Background:

  • Graphene exhibits long spin relaxation lengths, making it ideal for spintronics.
  • Spin injection into graphene is hindered by interface scattering and low optical absorption.
  • Direct optical spin injection is challenging due to graphene's weak spin-orbit coupling.

Purpose of the Study:

  • To develop a nondestructive optical spin injection method for graphene.
  • To overcome limitations of interface scattering and low optical absorption in graphene spintronics.
  • To achieve efficient spin injection and long-distance spin transport in graphene.

Main Methods:

  • Created sharp artificial interfaces between graphene and WSe2 monolayers.
  • Utilized circularly polarized light for spin-polarized carrier generation in WSe2.
  • Employed nonlocal electrical detection with Co/h-BN contacts to measure spin transport in graphene.
  • Investigated spin transport in graphene contacted to monolayer vs. bilayer WSe2.

Main Results:

  • Achieved spin-polarized carrier injection from WSe2 to graphene via optical excitation.
  • Demonstrated spin transport over a distance of 3.5 μm in graphene.
  • Confirmed the spin origin of the nonlocal signal through polarization-dependent measurements.
  • Showed the absence of the spin signal in graphene contacted to bilayer WSe2 due to restored inversion symmetry.

Conclusions:

  • The graphene/WSe2 monolayer interface enables efficient optical spin injection and transport.
  • This approach overcomes previous limitations in graphene spintronics.
  • The findings open new avenues for advanced spintronic devices utilizing 2D materials.