Mott Quantum Criticality in the Anisotropic 2D Hubbard Model

Abstract

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 $t_{\perp }$ acts as a control parameter driving the second-order critical end point $T_c$ of the metal-insulator transition down to zero at $t_{\perp }^c/t\simeq 0.2$. Below $t_{\perp }^c$, the volume of the hole and electron Fermi pockets of a compensated metal vanishes continuously at the Mott transition. Above $t_{\perp }^c$, 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.

4+ pages, plus supplemental material; v3: final version

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• Pseudogap to metal transition in the anisotropic two-dimensional Hubbard model
• Local moments versus itinerant antiferromagnetism: magnetic phase diagram and spectral properties of the anisotropic square lattice Hubbard model
• Mott transition in the Hubbard model on anisotropic honeycomb lattice with implications for strained graphene: Gutzwiller variational study
• Quantum criticality of bandwidth-controlled Mott transition
• Anisotropy crossover in the frustrated Hubbard model on four-chain cylinders
• Kinetics of thermal Mott transitions in the Hubbard model