Spin Filtered Edge States and Quantum Hall Effect in Graphene

Details Spin Filtered Edge States and Quantum Hall Effect in Graphene Spin Filtered Edge States and Quantum Hall Effect in Graphene

2006-02-27

arxiv.org/abs/cond-mat/0602645v2

Phys. Rev. Lett. 96, 176803 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figs

Scientific paper

10.1103/PhysRevLett.96.176803

Electron edge states in graphene in the Quantum Hall effect regime can carry both charge and spin. We show that spin splitting of the zeroth Landau level gives rise to counterpropagating modes with opposite spin polarization. These chiral spin modes lead to a rich variety of spin current states, depending on the spin flip rate. A method to control the latter locally is proposed. We estimate Zeeman spin splitting enhanced by exchange, and obtain a spin gap of a few hundred Kelvin.

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