Hard-core boson approach to the spin-1/2 triangular-lattice antiferromagnet Cs${}_2$CuCl${}_4$ at finite temperatures in magnetic fields higher than the saturation field

Simon Streib, Peter Kopietz

We study the high magnetic field regime of the antiferromagnetic insulator Cs${}_2$CuCl${}_4$ by expressing the spin-1/2 operators in the relevant Heisenberg model in terms of hard-cor…