Speaker
Mr
Matthias Puhr
(Regensburg University)
Description
With the recent experimental realization of Dirac and Weyl semimetals it has become possible to study the Chiral Magnetic Effect (CME) in clean table-top experiments. We present results of a mean-field study of the static Chiral Magnetic Conductivity (sCMC) in a simple lattice model of a parity-breaking Weyl semimetal. Our model is given by the lattice Wilson-Dirac Hamiltonian with on-site repulsive interaction and a constant chiral chemical potential term. The value of the sCMC for free Dirac fermions is well known and possible corrections due to fermion-interactions are often neglected. We study the model in the parameter space of bare Wilson-Dirac mass, inter-fermion interaction strength and bare chiral chemical potential and find that on-site repulsive interactions affect the sCMC almost exclusively through the enhancement of the renormalized chiral chemical potential. Non-trivial corrections to the sCMC due to inter-fermion interactions seem to be irrelevant in practice, since they become important only in a phase where the CME response is strongly suppressed by a large gap in the energy spectrum.
Primary authors
Mr
Matthias Puhr
(Regensburg University)
Dr
Pavel Buividovich
(Regensburg University)
Mr
Semen Valgushev
(University of Regensburg)
