196 citations · 2.6k across the 56 of their papers we have counts for
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Competition of density waves and quantum multicritical behavior in Dirac materials from functional renormalization
Laura Classen, Igor F. Herbut, Lukas Janssen +1
We study the competition of spin- and charge-density waves and their quantum multicritical behavior for the semimetal-insulator transitions of low-dimensional Dirac fermions. Emplo…
Critical and theories near six dimensions
Igor F. Herbut, Lukas Janssen
We consider -symmetric bosonic field theories above four dimensions, and propose a new reformulation in terms of an irreducible tensorial field with a cubic and Yukawa…
Excitonic instability of three-dimensional gapless semiconductors: Large-N theory
Lukas Janssen, Igor F. Herbut
Three-dimensional gapless semiconductors with quadratic band touching, such as HgTe, -Sn, or PrIrO are believed to display a non-Fermi-liquid ground state due to lon…
Fixed-point structure of low-dimensional relativistic fermion field theories: Universality classes and emergent symmetry
Friedrich Gehring, Holger Gies, Lukas Janssen
We investigate a class of relativistic fermion theories in 2<d<4 space-time dimensions with continuous chiral U(Nf)xU(Nf) symmetry. This includes a number of well-studied models, e…
Mott multicriticality of Dirac electrons in graphene
Laura Classen, Igor F. Herbut, Lukas Janssen +1
We study the multicritical behavior for the semimetal-insulator transitions on graphene's honeycomb lattice using the Gross-Neveu-Yukawa effective theory with two order parameters:…
Nematic quantum criticality in three-dimensional Fermi system with quadratic band touching
Lukas Janssen, Igor F. Herbut
We construct and discuss the field theory for tensorial nematic order parameter coupled to gapless four-component fermions at the quadratic band touching point in three (spatial) d…