Chirality-spin separation in the Hubbard model on the kagome lattice

Abstract

Effect of geometrical frustration in strongly-correlated metallic region is studied for the Hubbard model on the kagome lattice at half filling by a cluster extension of the dynamical mean-field theory combined with a continuous-time auxiliary-field quantum Monte Carlo method. We find that the electron correlation enhances the spin chirality in both vector and scalar channels. The chirality grows as decreasing temperature and exhibits a peak at a low temperature, indicating a new energy scale under strong correlation. The peak temperature is considerably lower than that for the local spin moment, namely, the characteristic temperatures for the chirality and the local moment are well separated. This is a signature of separation between spin and chiral degrees of freedom in the correlated metallic regime under geometrical frustration.

4 pages, 4 figures, Conference proceedings for International Conference on Magnetism 2009

References in corpus (2)

• Continuous-time auxiliary field Monte Carlo for quantum impurity models
• Mott transition in Kagomé lattice Hubbard model

Cited by in corpus (6)

• Mott transition and ferrimagnetism in the Hubbard model on the anisotropic kagomé lattice
• Chirality-driven mass enhancement in the kagome Hubbard model
• Temperature-driven transition from skyrmion to bubble crystals in centrosymmetric itinerant magnets
• Magnetic properties and Mott transition in the square-lattice Hubbard model with frustration
• Entanglement Spectrum in Cluster Dynamical Mean-Field Theory
• Magnetic phase diagram and Mott transition of the half-filled 1/5-depleted Hubbard model with frustration