Effect of short-range interactions on the quantum critical behavior of spinless fermions on the honeycomb lattice

Autor:	Mesterházy, D., Berges, J., von Smekal, L.
Rok vydání:	2012
Předmět:	Condensed Matter - Strongly Correlated Electrons Condensed Matter - Quantum Gases High Energy Physics - Phenomenology
Zdroj:	Phys.Rev. B86 (2012) 245431
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.86.245431
Popis:	We present a functional renormalization group investigation of an Euclidean three-dimensional matrix Yukawa model with U(N) symmetry, which describes N = 2 Weyl fermions that effectively interact via a short-range repulsive interaction. This system relates to an effective low-energy theory of spinless electrons on the honeycomb lattice and can be seen as a simple model for suspended graphene. We find a continuous phase transition characterized by large anomalous dimensions for the fermions and composite degrees of freedom. The critical exponents define a new universality class distinct from Gross-Neveu type models, typically considered in this context. Comment: 19 pages, 3 figures; revised and extended version accepted for publication in PRB
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1207.4054 Zobrazit plný text záznamu View this record from Arxiv