Quantum Fluctuations in the van der Walls material $\mathrm{NiP}{\mathrm{S}}_3$

Paula Mellado, Mauricio Sturla

We present the magnetic excitation spectrum of the quantum magnet $\mathrm{NiP}{\mathrm{S}}_3$ near the zig-zag ground state of a minimal honeycomb spin Hamiltonian that includes bilinear and biqu…