Regensburg 2019 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 52: Quantum Impurities and Kondo Physics

TT 52.9: Talk

Thursday, April 4, 2019, 11:45–12:00, H7

Mutual information in a frustrated Kondo lattice model — •Toshihiro Sato, Francesco Parisen Toldin, and Fakher F. Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany

A key notion in heavy fermion systems is the entanglement between conduction electrons and localized spin degrees of freedom. To study these systems from this point of view, we investigate the mutual information in a half-filled Kondo lattice model with geometrical frustration. In addition to the conventional Kondo insulating and antiferromagnetic phases, frustration leads to a so called partial Kondo screened phase [T. Sato, F. F. Assaad, T. Grover, Phys. Rev. Lett. 120, 107201 (2018)]. Using a negative-sign-free auxiliary field quantum Monte Carlo approach, we demonstrate that the area law coefficient of the mutual information shows sharp crossovers (on our finite lattices) at quantum phase transitions. Furthermore, and deep in the respective phases, it can be understood in terms of a product wave function [1].
F. Parisen Toldin, T. Sato, F. F. Assaad, arXiv:1811.11194 (2018)