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2 results

  • 7 - Optics and response functions

  • Mikhail I. Katsnelson, Radboud Universiteit Nijmegen
  • Book:
    The Physics of Graphene
    Published online:
    24 May 2020
    Print publication:
    19 March 2020, pp 168-192

  • Summary

    Optical properties of massless Dirac electrons are considered. In particular, it is shown that they provide a universal, frequency-independent adsorption coefficient determined by fine structure constant. The possible effect of interelectron interaction on this property is discussed. Using a perturbation theory for density matrix, we derive Kubo formula for various response functions and use it to consider optics, magnetooptics, charge screening and diamagnetism of massless Dirac electrons. Graphene plasmonics is briefly reviewed.

  • Non-Linear Diamagnetic Transport of the Large-Scale Magnetic Field in the Solar Convection Zone

  • V.N. Krivodubskij
  • Journal:
    Symposium - International Astronomical Union / Volume 157 / 1993
    Published online by Cambridge University Press:
    19 July 2016, pp. 49-50
    Print publication:
    1993
    • Article
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  • The mean magnetic field transport due to inhomogeneity of the turbulence intensity is considered taking the field back reaction on motion into account. In spite of the magnetic quenching, the downward diamagnetic pumping is still powerful enough to keep the fields of 3 to 4 kG strength near the SCZ base against the magnetic buoyancy.