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APS » Journals » Phys. Rev. B » Volume 81 » Issue 3
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Phys. Rev. B 81, 035421 (2010) [6 pages]

Features due to spin-orbit coupling in the optical conductivity of single-layer graphene

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P. Ingenhoven1, J. Z. Bernád1, U. Zülicke1,2, and R. Egger3
1Institute of Fundamental Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology, Massey University, Manawatu Campus, Private Bag 11 222, Palmerston North 4442, New Zealand
2Centre for Theoretical Chemistry and Physics, Massey University, Albany Campus, Private Bag 102904, North Shore MSC, Auckland 0745, New Zealand
3Institut für Theoretische Physik, Heinrich-Heine-Universität, D-40225 Düsseldorf, Germany

Received 4 November 2009; revised 21 December 2009; published 21 January 2010

We have calculated the optical conductivity of a disorder-free single graphene sheet in the presence of spin-orbit coupling, using the Kubo formalism. Both intrinsic and structural-inversion-asymmetry induced types of spin splitting are considered within a low-energy continuum theory. Analytical results are obtained that allow us to identify distinct features arising from spin-orbit couplings. We point out how optical-conductivity measurements could offer a way to determine the strengths of spin splitting due to various origins in graphene.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.81.035421
DOI:
10.1103/PhysRevB.81.035421
PACS:
81.05.U-, 72.10.Bg, 71.70.Ej
 
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