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Chirality and correlations in graphene.

Yafis Barlas1, T Pereg-Barnea, Marco Polini

  • 1Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA.

Physical Review Letters
|August 7, 2007
PubMed
Summary
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Coulomb interactions in graphene favor states with higher chirality, suppressing spin and charge susceptibilities. This effect arises from a quasiparticle chirality switch that boosts velocities near the Dirac point.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum mechanics

Background:

  • Graphene's low-energy behavior is modeled by a massless Dirac equation.
  • Eigenstates in this model possess defined chirality.
  • Coulomb interactions are significant in doped graphene.

Purpose of the Study:

  • To investigate the impact of Coulomb interactions on graphene's electronic properties.
  • To understand how chirality influences spin and charge susceptibilities.

Main Methods:

  • Evaluation of graphene's exchange energies.
  • Calculation of random-phase-approximation correlation energies.

Main Results:

  • Coulomb interactions in lightly doped graphene favor states with larger net chirality.

Related Experiment Videos

  • This tendency leads to suppressed spin and charge susceptibilities.
  • A quasiparticle chirality switch enhances quasiparticle velocities near the Dirac point.

    • Conclusions:

    • The interplay between Coulomb interactions and chirality significantly modifies graphene's electronic response.
    • Suppressed susceptibilities are a direct consequence of the chirality-dependent electronic structure.
    • Enhanced quasiparticle velocities near the Dirac point are linked to this phenomenon.