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Coulomb drag in graphene

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  • UserDr Mikhail Titov, Heriot-Watt U, Edinburgh
  • ClockThursday 09 February 2012, 13:45-15:00
  • HouseTheory Library.

If you have a question about this talk, please contact Dr Dimitri M Gangardt.

In this talk I present a theory of the Coulomb drag effect between two closely positioned graphene monolayers. In the limit of weak electron-electron interaction and small inter-layer spacing the drag is described by a universal function of the chemical potentials of the layers measured in the units of temperature. When both layers are tuned close to the Dirac point, the drag coefficient is proportional to the product of the chemical potentials. In the opposite limit of low temperature the drag is inversely proportional to both chemical potentials. For stronger interaction and larger values of layer separation the drag coefficient acquires logarithmic corrections and can no longer be described by a power law. In this regime a quantitative understanding of recent experimental data for graphene by-layers separated by a boron-nitride spacer can be achieved within our theory. In the case of strongly doped (or gated) graphene the usual Fermi-liquid result is recovered provided the screening length is smaller than the inter-layer spacing.

This talk is part of the Theoretical Physics Seminars series.

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