Abstract
We study transport in Weyl semimetals with isotropic Weyl nodes in the presence of Coulomb interactions or disorder at temperature . In the interacting clean limit, we determine the conductivity by solving a quantum Boltzmann equation within a “leading log” approximation and find it to be proportional to , up to logarithmic factors arising from the flow of couplings. In the noninteracting disordered case, we compute the Kubo conductivity and show that it behaves differently for and : in the former regime we recover a previous result, of a finite dc conductivity and a Drude width vanishing as ; in the latter, we find that vanishes linearly with with a leading term as equal to the clean, free-fermion result: . We compare our results to transport data on and comment on the possible relevance to recent experiments on .
- Received 18 October 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.046602
© 2012 American Physical Society