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Lenz, Benjamin; Manmana, Salvatore R.; Pruschke, Thomas; Assaad, Fakher F.; Raczkowski, Marcin (2016): Mott Quantum Criticality in the Anisotropic 2D Hubbard Model. In: Physical Review Letters, Vol. 116, No. 8, 86403
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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(perpendicular to) acts as a control parameter driving the second-order critical end point T-c of the metal-insulator transition down to zero at t(perpendicular to)(c)/t similar or equal to 0.2. Below t(perpendicular to)(,)(c) the volume of the hole and electron Fermi pockets of a compensated metal vanishes continuously at the Mott transition. Above t(perpendicular to)(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.