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. 2011 Jul 22;107(4):047206.
doi: 10.1103/PhysRevLett.107.047206. Epub 2011 Jul 21.

Observation of long spin-relaxation times in bilayer graphene at room temperature

T-Y Yang  1 , J Balakrishnan, F Volmer, A Avsar, M Jaiswal, J Samm, S R Ali, A Pachoud, M Zeng, M Popinciuc, G Güntherodt, B Beschoten, B Özyilmaz
Affiliations

Observation of long spin-relaxation times in bilayer graphene at room temperature

T-Y Yang et al. Phys Rev Lett. .

Abstract

We report on the first systematic study of spin transport in bilayer graphene (BLG) as a function of mobility, minimum conductivity, charge density, and temperature. The spin-relaxation time τ(s) scales inversely with the mobility μ of BLG samples both at room temperature (RT) and at low temperature (LT). This indicates the importance of D'yakonov-Perel' spin scattering in BLG. Spin-relaxation times of up to 2 ns at RT are observed in samples with the lowest mobility. These times are an order of magnitude longer than any values previously reported for single-layer graphene (SLG). We discuss the role of intrinsic and extrinsic factors that could lead to the dominance of D'yakonov-Perel' spin scattering in BLG. In comparison to SLG, significant changes in the carrier density dependence of τ(s) are observed as a function of temperature.

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