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Spin-dependent polaron formation in pristine graphene

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Abstract

We investigate the effects of spin-orbit couplings on the electron (hole)-E2g phonon interaction in graphene. We examine the effects of spin-orbit couplings on electron and hole polaron formation as well as DC conductivity, and spin polarizations of charge carriers. We use Fröhlich type Hamiltonian to describe the electron-phonon system within the continuum limit. Our theoretical analysis shows that, the polaronic effect is decreased due to the spin-orbit couplings, for both spin and pseudospin states, but it is enhanced beyond some critical values of wavevector for spin-up states of both sublattices in the presence of spin-orbit couplings. The Rashba spin-orbit coupling in the graphene single layer splits up- and down- states, and produces perfect spin polarized conductivity. Also the phonon-restricted and phonon-assisted conduction are reported for positive and negative Fermi energies.

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Authors and Affiliations

  1. Department of Physics, Faculty of Sciences, Ankara University, 06100 Tandoğan, Ankara, Turkey

    A. Mogulkoc & B.S. Kandemir

  2. Department of Physics, Ferdowsi University of Mashhad, Mashhad, Iran

    M. Modarresi

Authors
  1. A. Mogulkoc
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  2. M. Modarresi
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  3. B.S. Kandemir
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Correspondence to A. Mogulkoc.

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Mogulkoc, A., Modarresi, M. & Kandemir, B. Spin-dependent polaron formation in pristine graphene. Eur. Phys. J. B 88, 49 (2015). https://doi.org/10.1140/epjb/e2015-50727-0

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