Quantum Hall effective action for anisotropic Dirac semi-metal

Abstract

We present a study of Hall transport in semi-Dirac critical phases. The construction is based on a covariant formulation of relativistic systems with spatial anisotropy. Geometric data together with external electromagnetic fields is used to devise an expansion procedure that leads to a lowenergy effective action consistent with the discrete P T symmetry that we impose. We use the action to discuss terms contributing the Hall transport and extract the coefficients. We also discuss the associated scaling symmetry.