Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: Charge Order
TT 42.1: Vortrag
Dienstag, 13. März 2018, 10:15–10:30, HFT-FT 131
Charge order and Frustration on the triangular lattice - A Monte Carlo Study of the Falicov-Kimball model — •Miguel M. Oliveira1, Andrey Antipov3, Pedro Ribeiro1, and Stefan Kirchner2 — 1Instituto Superior Técnico, Universidade de Lisboa Av. Rovisco Pais, 1049-001 Lisboa, Portugal — 2Center for Correlated Matter, Zhejiang University, Hangzhou, Zhejiang 310058, China — 3Station Q, Microsoft Research, Santa Barbara, California 93106, USA
The Falicov-Kimball model is commonly used as one of the simplest possible models to study the metal-insulator transition. Recently, it has been shown that the half-filled Falicov-Kimball model on the square lattice, above the charge order transition, has a richer phase diagram than originally anticipated [1].
In this talk we present the extension of these results to the triangular lattice. In particular, for 1/3 filling, we find that the high temperature disordered phases are similar to those found for the half-filled square lattice.
At low temperatures and large coupling, the ordered phase has a broken Z3 symmetry and the transition into this state is of the same universality as the three-state Potts model.
We investigate the possibility that frustration effects in the weak-coupling regime and at low temperatures may destroy the Z3-broken phase and induce other kinds of ordered or liquid states.
A.Antipov et al PRL 117 146601 (2016).