Dissipationless dynamics of spin supersolid states in a spin- 1 2 triangular antiferromagnet with impurities

作者：Yixuan Huang, Yuan Gao, Wei Li, Seiji Yunoki, Sadamichi Maekawa · 发表于：Physical review. B./Physical review. B · 年份：2026 · DOI：10.1103/wrn1-zb38 · 被引用次数：1 · 研究领域：Physics of Superconductivity and Magnetism、Advanced Condensed Matter Physics、Iron-based superconductors research

Motivated by recent experimental evidence for spin supersolid states in triangular-lattice compounds, we numerically investigate the dynamical properties of magnetic field-induced phases in the spin-1/2 easy-axis triangular antiferromagnetic Heisenberg model in the presence of magnetic impurities. In both weak- and strong-field spin supersolid states, the gapless Goldstone mode at the $K$ points remains robust against impurities, which is a direct manifestation of spin superfluidity. By contrast, at the same impurity density, impurities induce a splitting of the magnon bands in the conventional magnetic state, the so-called up-up-down state. In addition, the finite superfluid stiffness probed by the twisted phase in the spin supersolid states is consistent with the excitation spectrum. We argue that the excitation spectrum with impurities provides direct spectroscopic evidence for dissipationless spin dynamics in the spin supersolid states, which is experimentally accessible via inelastic neutron scattering.