Correlated double-Weyl semimetals with Coulomb interactions: Possible applications to HgCr2Se4 and SrSi2
Abstract
We study the fate of double-Weyl fermions in three-dimensional systems in the presence of long-range Coulomb interactions. By employing the momentum-shell renormalization-group approach, we find that the fixed point of noninteracting double-Weyl fermions is unstable against Coulomb interactions and flows to a nontrivial stable fixed point with anisotropic screening effect. Moreover, experimentally measurable quantities such as specific heat obtain unusual logarithmic corrections. We also discuss implications of our results to three-dimensional materials HgCr2Se4 and SrSi2, candidate materials of hosting double-Weyl fermions.
- Publication:
-
Physical Review B
- Pub Date:
- July 2015
- DOI:
- 10.1103/PhysRevB.92.045121
- arXiv:
- arXiv:1503.07429
- Bibcode:
- 2015PhRvB..92d5121J
- Keywords:
-
- 71.10.Ay;
- 71.10.Hf;
- 74.40.Kb;
- Fermi-liquid theory and other phenomenological models;
- Non-Fermi-liquid ground states electron phase diagrams and phase transitions in model systems;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 11.1 pages, 4 figures, published version in Physical Review B