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arXiv · 1703.08801

Gross-Neveu-Yukawa model at three loops and Ising critical behavior of Dirac systems

Luminita N. Mihaila·Nikolai Zerf·Bernhard Ihrig·Igor F. Herbut·Michael M. Scherer
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Abstract

Dirac and Weyl fermions appear as quasi-particle excitations in many different condensed-matter systems. They display various quantum transitions which represent unconventional universality classes related to the variants of the Gross-Neveu model. In this work we study the bosonized version of the standard Gross-Neveu model -- the Gross-Neveu-Yukawa theory -- at three-loop order, and compute critical exponents in $4-ε$ dimensions for general number of fermion flavors. Our results fully encompass the previously known two-loop calculations, and agree with the known three-loop results in the purely bosonic limit of the theory. We also find the exponents to satisfy the emergent super-scaling relations in the limit of a single-component fermion, order by order up to three loops. Finally, we apply the computed series for the exponents and their Padé approximants to several phase transitions of current interest: metal-insulator transitions of spin-1/2 and spinless fermions on the honeycomb lattice, emergent supersymmetric surface field theory in topological phases, as well as the disorder-induced quantum transition in Weyl semimetals. Comparison with the results of other analytical and numerical methods is discussed.

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Luminita N. Mihaila, Nikolai Zerf, Bernhard Ihrig, Igor F. Herbut, Michael M. Scherer. 2017-03-26. Gross-Neveu-Yukawa model at three loops and Ising critical behavior of Dirac systems. https://doi.org/10.1103/physrevb.96.165133

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