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5 papers · 2 filters
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…
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…
Quantum oscillations in heavy fermion compound YbPtBi
E. Mun, S. L. Bud'ko, Y. Lee +4
We present quantum oscillations observed in the heavy fermion compound YbPtBi in magnetic fields far beyond its field-tuned, quantum critical point. Quantum oscillations are observ…
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…