Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 18: f-Electron Systems and Heavy Fermions II

TT 18.5: Talk

Monday, March 12, 2018, 16:00–16:15, H 3005

Partial Kondo screening in a frustrated Kondo lattice model — •Toshihiro Sato¹, Fakher F. Assaad¹, and Tarun Grover² — ¹Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Germany — ²Department of Physics, University of California at San Diego, USA

We study a half-filled Kondo lattice model on the honeycomb lattice with geometrical frustration. The geometrical frustration adds a new competing energy scale in the Doniach phase diagram which conventionally accounts only for the competition between the RKKY interaction and the Kondo screening. Using a negative-sign-free auxiliary field quantum Monte Carlo approach, we map out the phase diagram in the presence of geometrical frustration. In addition to the conventional Kondo insulator and the anti-ferromagnetically ordered state, we provide evidence for a novel ‘partial Kondo screened’ phase. In this phase, the spins are selectively screened so as to alleviate frustration, and the lattice rotation symmetry is broken nematically [1].
T. Sato, F. F. Assaad, T. Grover, arXiv:1711.03116 (2017)