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Spin transport and relaxation in graphene

Guido Burkard (University of Konstanz, Germany)
Wed, 08/02/2012 - 12:00pm to 1:00pm
S13-M01-11 (Physics Conference Room)
Event Type: 


We calculate the spin relaxation time of extended carriers due to spin precession between random impurity scattering (D'yakonov-Perel' mechanism) in graphene. In single-layer graphene, we find that the interplay of the Larmor precession of the spin and the orbital cyclotron motion in the presence of a perpendicular field leads to a crossover between a normal and an anomalous D'yakonov-Perel' behavior. In the case of electrically gated bilayer graphene, we find that the trigonal warping of the bandstructure leads to an interesting non-monotonic behavior of the spin relaxation time as a function of both the Fermi energy and the interlayer bias potential. Our results are in good agreement with recent experimental studies of bilayer graphene and indicate the possibility of an electrically switched spin device.

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