We study the Kondo Lattice and the Hubbard models on a triangular lattice. We find that at
the mean-field level, these rotationally invariant models naturally support a noncoplanar …

Magnetic susceptibility, NMR, muon spin relaxation, and inelastic neutron scattering
measurements show that kapellasite, Cu 3 Zn (OH) 6 Cl 2, a geometrically frustrated spin …

Inspired by the recent discovery of a new instability towards a chiral phase of the classical
Heisenberg model on the kagome lattice, we propose a specific chiral spin liquid that …

We consider some classical and frustrated lattice spin models with global O (3) spin
symmetry. No general analytical method to find a ground state exists when the spin …

We present the mean-field phase diagram of electrons in a kagome flat band with repulsive
interactions. In addition to flat-band ferromagnetism, the Hartree-Fock analysis yields …

Classical Heisenberg antiferromagnets on two-dimensional kagome and three-dimensional
hyperkagome lattices are investigated by Monte Carlo simulations. For both models the …

A promising route towards the realization of chiral spin liquids is the quantum melting of
classically noncoplanar spin states via quantum fluctuations. In the classical realm, such …

The triangular-lattice Heisenberg antiferromagnet (HAF) is known to carry topological Z 2
vortex excitations which form a gas at finite temperatures. Here we show that the spin-orbit …

Motivated by recent experiments on the Heisenberg S= 1/2 quantum spin liquid candidate
material kapellasite, we classify all possible chiral (time-reversal symmetry breaking) spin …

We study the behavior of the quarter-filled Kondo-lattice model on a triangular lattice by
combining a zero-temperature variational approach and finite-temperature Monte Carlo …