Dynamics and stability of U(1) spin liquids beyond mean-field theory: Triangular-lattice J 1 - J 2 Heisenberg model
This work extends parton mean-field theory to study quantum spin liquids in a triangular lattice Heisenberg model with competing interactions (J1 and J2) without free parameters. The calculation reveals that spinon interactions create a sharp paramagnon mode, which acts as a bound state of two spinons, providing insight into the dynamical response and stability of the QSL phase.