Revisiting the $J_1$-$J_2$ Heisenberg Model on a Triangular Lattice: Quasi-Degenerate Ground States and Phase Competition

Oleksandra Kovalska, Ester Pagès Fontanella, Benedikt Schneider +2

It is generally believed that the spin-$\frac{1}{2}$ triangular-lattice $J_1$-$J_2$ Heisenberg model hosts a quantum spin liquid in the intermediate regime between the $120^{\circ }$…