Oral: Axionic quantum criticality in correlated multi-Weyl semimetals

In three-dimensional generalized or multi-Weyl semimetals, short-range Hubbard-like electron-electron interactions promote the formation of an axionic charge-density wave, breaking the lattice translational symmetry. While conventional Weyl semimetals with linear dispersion in all three directions exhibit a mean-field or Gaussian quantum criticality, multi-Weyl semimetals, characterized by anisotropic band dispersion that is linear along the Weyl-point separation direction and non-linear in the orthogonal plane, are expected to display non-Gaussian critical behavior in the vicinity of the axionic instability.Importantly, the absence of Lorentz symmetry in these systems complicates the application of standard field-theoretic methods. In this work, we develop a novel theoretical framework to describe the axionic quantum critical point in multi-Weyl semimetals, particularly focusing on double and triple Weyl semimetals, revealing non-mean field critical exponents. We will also discuss the experimental signatures of these exponents in observable quantities, such as the optical conductivity and specific heat.