A Series Expansion Study for Large Negative Quantum Renormalization of Magnon Spectra in the $S=1/2$ Kagome-Lattice Heisenberg Antiferromagnet Cs${}_2$Cu${}_3$SnF${}_{12}$

Singo Kogure, Masashi Takeda, Katsuhiro Morita +3

The series expansion method is used to study magnon spectra of the kagome system with nearest-neighbor exchange interaction $J$ and out-of-plane Dzyaloshinskii-Moriya (DM) interact…