Phys. Rev. Lett. 107, 047206 (2011) [4 pages]Observation of Long Spin-Relaxation Times in Bilayer Graphene at Room TemperatureReceived 27 November 2010; published 21 July 2011 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 τs 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 τs are observed as a function of temperature. © 2011 American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.107.047206
DOI:
10.1103/PhysRevLett.107.047206
PACS:
85.75.-d, 72.25.Dc, 72.25.Rb, 72.80.Vp
See AlsoSee Also: Wei Han and R. K. Kawakami, Spin Relaxation in Single-Layer and Bilayer Graphene, Phys. Rev. Lett. 107, 047207 (2011). |
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