Renormalization Group Approach to Stability of Two-dimensional Interacting Type-II Dirac Fermions
arXiv:1609.01448 · doi:10.1103/PhysRevB.95.195412
Abstract
The type-II Weyl/Dirac fermions are a generalization of conventional or type-I Weyl/Dirac fermions, whose conic spectrum is tilted such that the Fermi surface becomes lines in two dimensions, and surface in three dimensions rather than discrete points of the conventional Weyl/Dirac fermions. The mass-independent renormalization group calculations show that the tilting parameter decreases monotonically with respect to the length scale, which leads to a transition from two dimensional type-II Weyl/Dirac fermions to the type-I ones. Because of the non-trivial Fermi surface, a photon gains a finite mass partially via the chiral anomaly, leading to the strong screening effect of the Weyl/Dirac fermions. Consequently, anisotropic type-II Dirac semimetals become stable against the Coulomb interaction. This work provides deep insight into the interplay between the geometry of Fermi surface and the Coulomb interaction.
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Cited by in corpus (6)
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- Polarization tensor for tilted Dirac fermion materials: Covariance in deformed Minkowski spacetime
- Condition for the emergence of a bulk Fermi arc in disordered Dirac-fermion systems
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