Abstract
The description of the electromagnetic interaction in two-dimensional Dirac materials, such as graphene and transition-metal dichalcogenides, in which electrons move in the plane and interact via virtual photons in 3d, leads naturally to the emergence of a projected non-local theory, called pseudo-quantum electrodynamics (PQED), as an effective model suitable for describing electromagnetic interaction in these systems. In this work, we investigate the role of a complete set of four-fermion interactions in the renormalization group functions when we coupled it with the anisotropic version of massive PQED, where we take into account the fact that the Fermi velocity is not equal to the light velocity. We calculate the electron self-energy in the dominant order in the $1/N$ expansion in the regime where $m ^ 2 \ll p ^ 2$. We show that the Fermi velocity renormalization is insensitive to the presence of quartic fermionic interactions, whereas the renormalized mass may have two different asymptotic behaviors at the high-density limit, which means a high-energy scale.
Highlights
The description of the electromagnetic interaction in two-dimensional Dirac materials, such as graphene and transition-metal dichalcogenides, in which electrons move in the plane and interact via virtual photons in 3D, leads naturally to the emergence of a projected theory, called pseudo-quantum electrodynamics (PQED), as an effective model suitable for describing electromagnetic interaction in these systems
We investigate the role of a complete set of four-fermion interactions in the renormalization group functions when we coupled it with the anisotropic version of massive PQED, where we take into account the fact that the Fermi velocity is not equal to the light velocity
We show that the Fermi velocity renormalization is insensitive to the presence of quartic fermionic interactions, whereas the renormalized mass may have two different asymptotic behaviors at the high-density limit, which means a high-energy scale
Summary
Four-fermion interactions have been extensively studied in the literature, both for understanding conceptual aspects of quantum field theory as well as for applications in condensed matter physics. The incorporation of vacuum polarization effects provides a better behavior for the Green functions in the ultraviolet regime Both the Gross-Neveu [7] and. The four-fermion interactions become relevant, as an attempt to obtain a more complete description of these systems, within a quantum-field-theory approach. This more realistic description should take into account some of the microscopic interactions that, such as disorder or impurity, may emerge in these materials. Thereafter, we use a Hubbard-Stratonovich transform in the four-fermion interactions, given by
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