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Strong electron-pho...
Strong electron-phonon coupling in the sigma band of graphene
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Mazzola, Federico (författare)
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Frederiksen, Thomas (författare)
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Balasubramanian, Thiagarajan (författare)
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visa fler...
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Hofmann, Philip (författare)
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- Hellsing, Bo, 1952 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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Wells, Justin (författare)
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visa färre...
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(creator_code:org_t)
- 2016
- 2016
- Engelska.
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Ingår i: arXiv. ; , s. 1-11
- Relaterad länk:
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https://gup.ub.gu.se...
Abstract
Ämnesord
Stäng
- First-principles studies of the electron-phonon coupling in graphene predict a high coupling strength for the ? band with values of the dimensionless electron-phonon coupling constant ? up to 0.9. Near the top of the ? band ? is found to be ≈ 0.7. This value is consistent with the observed kink in the ? band dispersion near the Γ-point in the Brillouin zone [1]. The calculations show that the electron-phonon coupling is driven primarily by the optical LO and TO phonon modes in graphene. The photoemission intensity from the ? band is strongly suppressed near the Γ-point due to sub-lattice interference effects. These effects are removed by taking data in the neighbouring Brillouin zone. By this we have been able to disentangle the influence of sub-lattice interference and electron-phonon coupling. Whilst superconductivity has been absent from graphene's list of exceptional properties, despite considerable experimental attempts, we speculate that if the strong EPC in the ? band survives a modification that shifts it to the Fermi level, e.g. by means of atomic substitution, a superconducting transition temperatures of around 70 K could be reached.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- graphene
- electron structure
- phonon structure
- electron-phonon coupling
- sigma band
- superconductivity
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