Thermodynamic, magnetic, and transport properties of the repulsive Hubbard model on the kagome lattice
Andressa R. Medeiros-Silva, Natanael C. Costa, Thereza Paiva
Abstract
Over the past few decades, magnetic frustration has been under intense debate due to its unusual properties. For instance, frustration in the kagome lattice suppresses long-range spin correlations, and it is expected to be a candidate for a spin liquid system. Therefore, with the advent of experiments with ultracold atoms, the interest in frustrated geometries has increased. Given this, in the present work we investigate the repulsive Hubbard model on the kagome lattice using unbiased quantum Monte Carlo simulations. We examine its thermodynamic properties, as well as the magnetic and transport response of the system at finite temperatures and different values of the repulsive interaction. From these results, we discuss the possible occurrence of adiabatic cooling, a quite important feature in ultracold systems, and the presence of a metal-to-insulator transition at a finite interaction strength. Our findings may guide future experiments in ultracold fermionic atoms on the kagome lattice.