7 papers
Quantum critical fan and emergent relativistic symmetry of two-dimensional Dirac semimetals
Friederike Ihssen, Bilal Hawashin, Mireia Tolosa-Simeón +1
Two-dimensional Dirac semimetals near a quantum critical point can be described by Gross--Neveu--Yukawa models. In view of recent experimental advances exhibiting a transition from…
Spontaneous symmetry breaking of in Gross--Neveu theory from expansion
Bilal Hawashin, Max Uetrecht
It was recently established that the paradigmatic Gross--Neveu model with copies of two-dimensional Dirac fermions features an symmetry if certain interaction…
Relativistic Mott transition and high-order van Hove singularity in twisted double bilayer WSe: mean-field and functional renormalization group study
Bilal Hawashin, Julian Kleeschulte, David Kurz +2
Experiments on twisted double bilayer tungsten diselenide have demonstrated that moir'e semiconductors can realize a relativistic Mott transition, i.e., a quantum phase transition…
Spontaneous Space-Time Parity Breaking Without Thermal Restoration
Bilal Hawashin, Michael M. Scherer, Michael Smolkin +1
We construct an ultraviolet-complete, local, and unitary quantum field theory in 2+1 dimensions that exhibits spontaneous breaking of space-time parity, persisting to arbitrarily h…
Gross-Neveu-XY quantum criticality in moiré Dirac materials
Bilal Hawashin, Michael M. Scherer, Lukas Janssen
Two-dimensional van-der-Waals materials offer a highly tunable platform for engineering electronic band structures and interactions. By employing techniques such as twisting, gatin…
UV complete local field theory of persistent symmetry breaking in 2+1 dimensions
Bilal Hawashin, Junchen Rong, Michael M. Scherer
Spontaneous symmetry breaking can persist at all temperatures in certain biconical vector models when the underlying field theories are ultraviol…