Spin Relaxation in Single-Layer
Graphene with Tunable
Mobility
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Abstract
Graphene is an attractive material for spintronics due
to theoretical
predictions of long spin lifetimes arising from low spin–orbit
and hyperfine couplings. In experiments, however, spin lifetimes in
single-layer graphene (SLG) measured via Hanle effects are much shorter
than expected theoretically. Thus, the origin of spin relaxation in
SLG is a major issue for graphene spintronics. Despite extensive theoretical
and experimental work addressing this question, there is still little
clarity on the microscopic origin of spin relaxation. By using organic
ligand-bound nanoparticles as charge reservoirs to tune the mobility
between 2700 and 12 000 cm<sup>2</sup>/(V s), we successfully
isolate the effect of charged impurity scattering on spin relaxation
in SLG. Our results demonstrate that, while charged impurities can
greatly affect mobility, the spin lifetimes are not affected by charged
impurity scattering