Nematic Metal and Antiferromagnetic Insulator on Hexagonal Kagome Lattice

Abstract

Hexagonal Kagome lattice is a multiband system with a quadratic band crossing point, in contrast with honeycomb lattice with linear band crossing point, which has exotic correlated effect and can produce various novel quantum states. Here we investigate the phase diagram of the fermions on the hexagonal Kagome lattice as a function of interaction, temperature and lattice anisotropy, by combining the cellular dynamical mean-field theory with the continuous time quantum Monte Carlo method. For weak interaction, the quadratic band-crossing point is broken to linear band crossing point and the system is the semi-metal. With the increasing of the interaction, the system goes a first order transition to antiferromagnetic Mott insulator at low temperature. Below a critical temperature, due to the charge nematic fluctuation, a nematic metal forms between the weak coupling semi-metal and strong correlated Mott insulator. When the lattice anisotropy increases, the region of the nematic metal is enlarged. Furthermore, we discuss how to detect these phases in real experiments.

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