We present an analytic calculation of the conductivity of pure graphene as a function of frequency omega, wave-vector k, and temperature for the range where the energies related to all these parameters are small in comparison with the band parameter gamma similar or equal to 3 eV, but much larger than the collision rate tau(-1). The simple asymptotic expressions are given in various limiting cases. For instance, the conductivity for kv(0) << T << omega is equal to sigma(omega,k)=e(2)/4 (h) over bar and independent of the and structure parameters gamma and nu(0). Our results are also used to explain the known dependence of the graphite conductivity on temperature and pressure.
Space-time dispersion of graphene conductivity
2007
Abstract
We present an analytic calculation of the conductivity of pure graphene as a function of frequency omega, wave-vector k, and temperature for the range where the energies related to all these parameters are small in comparison with the band parameter gamma similar or equal to 3 eV, but much larger than the collision rate tau(-1). The simple asymptotic expressions are given in various limiting cases. For instance, the conductivity for kv(0) << T << omega is equal to sigma(omega,k)=e(2)/4 (h) over bar and independent of the and structure parameters gamma and nu(0). Our results are also used to explain the known dependence of the graphite conductivity on temperature and pressure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
