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Spin Manipulation in Graphene by Chemically Induced Pseudospin Polarization
Dinh Van Tuan1, Stephan Roche1,2
1Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, Spain.
Fluorine adatoms in graphene offer a new way to control electron spin transport. This breakthrough enables electrostatic tuning of spin lifetimes, paving the way for advanced spintronic devices.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Spin manipulation is crucial for spintronic devices, with graphene being a promising material.
- Current paradigms and demonstrators for spin manipulation in graphene are limited.
Purpose of the Study:
- To investigate the effect of impurities, specifically fluorine adatoms, on spin transport in graphene.
- To explore the potential for engineering spin device functionality through chemical modification.
Main Methods:
- Theoretical analysis of fluorine adatoms on graphene, focusing on their impact on sublattice symmetry and magnetic moments.
- Investigation of impurity resonance levels and their association with long-range sublattice pseudospin polarization.
- Analysis of spin lifetime electron-hole asymmetry and electrostatic tuning capabilities.
Main Results:
- Fluorine adatoms break sublattice symmetry locally without forming strong magnetic moments, leading to varied spin transport.
- A long-range sublattice pseudospin polarization is linked to the impurity resonance level.
- Significant electron-hole asymmetry in spin lifetimes is observed, decoupling spin and pseudospin dynamics.
Conclusions:
- Spin lifetimes in graphene with dilute fluorine adatoms can be electrostatically tuned from 100 picoseconds to several nanoseconds.
- This provides a novel protocol for chemically engineering unprecedented spin device functionality.
- The findings highlight the potential of impurity engineering for advanced spintronics.
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