Mott Quantum Criticality in the Anisotropic 2D Hubbard Model

We present evidence for Mott quantum criticality in an anisotropic two-dimensional system of coupled Hubbard chains at half-filling. In this scenario emerging from variational cluster approximation and cluster dynamical mean-field theory, the interchain hopping t⊥ acts as control parameter driving the second-order critical endpoint Tc of the metal-insulator transition down to zero at tc⊥/t≃0.2. Below tc⊥ the volume of hole and electron Fermi pockets of a compensated metal vanishes continuously at the Mott transition. Above tc⊥ the volume reduction of the pockets is cut off by a first-order transition. We discuss the relevance of our findings to a putative quantum critical point in layered organic conductors whose location remains elusive so far.