Theory and model analysis of spin relaxation time in graphene - Could it be used for spintronics?

Autor(en)

Ferenc Simon, Ferenc Murányi, Balázs Dóra

Abstrakt

Graphene appears to be an excellent candidate for spintronics due to the low spin-orbit coupling in carbon, the two-dimensional nature of the graphene sheet, and the high electron mobility. However, recent experiments by Tombros et al. [Nature 448, 571 (2007).] found a prohibitively short spin-decoherence time in graphene. We present a comprehensive theory of spin decoherence in graphene including intrinsic, Bychkov-Rashba, and ripple related spin-orbit coupling. We find that the available experimental data can be explained by an intrinsic spin-orbit coupling which is orders of magnitude larger than predicted in first principles calculations. We show that comparably large values are present for structurally and electronically similar systems, MgB(2) and Li intercalated graphite. The spin-relaxation in graphene is neither due to the Elliott-Yafet nor due to the Dyakonov-Perel mechanism but a smooth crossover between the two regimes occurs near the Dirac point as a function of the chemical potential.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Universität Zürich (UZH), Budapest University of Technology and Economics

Journal

Physica Status Solidi. B: Basic Research

Band

248

Seiten

2631-2634

Anzahl der Seiten

4

ISSN

0370-1972

DOI

https://doi.org/10.1002/pssb.201100242

Publikationsdatum

2011

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/3510499a-1ba1-452e-82e6-8d1428347c9b