Spin Relaxation in Single Layer and Bilayer Graphene

Details Spin Relaxation in Single Layer and Bilayer Graphene Spin Relaxation in Single Layer and Bilayer Graphene

2010-12-15

arxiv.org/abs/1012.3435v2

Phys. Rev. Lett. 107, 047207 (2011)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.107.047207

We investigate spin relaxation in graphene spin valves and observe strongly contrasting behavior for single layer graphene (SLG) and bilayer graphene (BLG). In SLG, the spin lifetime ({\tau}s) varies linearly with the momentum scattering time ({\tau}p) as carrier concentration is varied, indicating the dominance of Elliot-Yafet (EY) spin relaxation at low temperatures. In BLG, {\tau}s and {\tau}p exhibit an inverse dependence, which indicates the dominance of Dyakonov-Perel spin relaxation at low temperatures. The different behavior is due to enhanced screening and/or reduced surface sensitivity of BLG, which greatly reduces the impurity-induced EY spin relaxation.

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