Double Dirac fermions have recently been identified as possible quasiparticles hosted by three-dimensional crystals with particular non-symmorphic point group symmetries. Applying a combined approach of ab-initio methods and dynamical mean field theory, we investigate how interactions and double Dirac band topology conspire to form the electronic quantum state of Bi2CuO4. We derive a downfolded eight-band model of the pristine material at low energies around the Fermi level. By tuning the model parameters from the free band structure to the realistic strongly correlated regime, we find a persistence of the double Dirac dispersion until its constituting time reveral symmetry is broken due to the onset of magnetic ordering at the Mott transition. We analyze pressure as a promising route to realize a double-Dirac metal in Bi2CuO4.
@article{arxiv.1703.10087,
title = {Strongly correlated double Dirac fermions},
author = {Domenico Di Sante and Andreas Hausoel and Paolo Barone and Jan M. Tomczak and Giorgio Sangiovanni and Ronny Thomale},
journal= {arXiv preprint arXiv:1703.10087},
year = {2017}
}