Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Correlated Electrons: Quantum-Critical Phenomena - Theory

TT 35.2: Vortrag

Dienstag, 8. März 2016, 14:15–14:30, H21

Monte Carlo study of competing orders in a nearly antiferromagnetic metal — •Max Henner Gerlach¹, Yoni Schattner², Simon Trebst¹, and Erez Berg² — ¹Institute for Theoretical Physics, University of Cologne, Cologne, Germany — ²Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot, Israel

We study the onset of antiferromagnetism in itinerant electron systems via a two-dimensional lattice model amenable to sign-problem-free determinantal quantum Monte Carlo simulations. These numerically exact simulations allow to precisely determine not only the boundaries of the magnetic phase, but also a dome-shaped d-wave superconducting phase near the putative antiferromagnetic quantum critical point. We discuss the entire phase diagram of this 2D model with regard to antiferromagnetic, superconducting, charge density wave, and pair density wave susceptibilities, as well as the superfluid density. We further find fluctuation diamagnetism well above the superconducting T_c and demonstrate where the electronic density of states displays the opening of a gap. Our results provide insights into the interplay of antiferromagnetism and unconventional superconductivity at intermediate to strong coupling.