含杂质的自旋1/2三角反铁磁体中自旋超固体态的无耗散动力学
Dissipationless dynamics of spin supersolid states in a spin-1/2 triangular antiferromagnet with impurities
AI总结：
基于三角晶格化合物中自旋超固体态的实验证据，对含杂质的自旋1/2易轴三角反铁磁海森堡模型进行数值研究，发现超固体态K点无隙模对杂质鲁棒，传统磁态磁振子能带分裂，且激发谱为无耗散自旋动力学提供证据。
摘要：
受三角晶格化合物中自旋超固体态近期实验证据的启发，我们对存在磁性杂质的自旋1/2易轴三角反铁磁海森堡模型中磁场诱导相的动力学性质进行了数值研究。在弱场和强场自旋超固体态中，K点处的无隙戈德斯通模对杂质具有鲁棒性，这是自旋超流性的直接体现。相比之下，在相同杂质密度下，杂质会导致传统磁态（即所谓的上上 - 下态）中磁振子能带分裂。此外，自旋超固体态中由扭曲相位探测到的有限超流刚度与激发谱一致。我们认为含杂质的激发谱为自旋超固体态中的无耗散自旋动力学提供了直接的光谱证据，这可通过非弹性中子散射在实验中获取。
英文摘要：
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.
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