Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 59: Low-Dimensional Systems: Poster Session
TT 59.6: Poster
Mittwoch, 9. März 2016, 15:00–18:30, Poster D
Mott quantum criticality in the anisotropic 2D Hubbard model — •Benjamin Lenz1, Salvatore R. Manmana1, Thomas Pruschke1, Fakher F. Assaad2, and Marcin Raczkowski2,3 — 1Institute for Theoretical Physics, Georg-August-Universität Göttingen, Germany — 2Institute for Theoretical Physics and Astrophysics, Julius-Maximilians-Universität Würzburg, Germany — 3Department of Physics and Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, Germany
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 t⊥c/t≃ 0.2. Below t⊥c the volume of hole and electron Fermi pockets of a compensated metal vanishes continuously at the Mott transition. Above t⊥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.
Financial support via DFG through FOR1807 is gratefully acknowledged.