Optical Hall conductivity of systems with gapped spectral nodes
Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany
Received: 29 September 2012
Received in final form: 23 November 2012
Published online: 13 February 2013
We calculate the optical Hall conductivity within the Kubo formalism for systems with gapped spectral nodes, where the latter have a power-law dispersion with exponent n. The optical conductivity is proportional to n and there is a characteristic logarithmic singularity as the frequency approaches the gap energy. The optical Hall conductivity is almost unaffected by thermal fluctuations and disorder for n = 1, whereas disorder has a stronger effect on transport properties if n = 2.
Key words: Solid State and Materials
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2013