论文标题
从沮丧的磁铁中从扩散到超级流体运输的跨界
Crossover from Diffusive to Superfluid Transport in Frustrated Magnets
论文作者
论文摘要
我们研究了沮丧的抗铁磁绝缘子跨磁相图的自旋传输，并发现了从自旋扩散到自旋超流体的转运状态的急剧修饰。我们在与易于平面各向异性的最接近邻居和最新的邻居交换相互作用中采用三角形晶格，我们在整个磁相图上进行了两端构型上的原子旋转模拟。我们发现，只要基态磁矩保留在平面内，无论磁性构型是铁磁，胶线还是非电线性抗抗铁磁性，该系统都会表现出具有独立于交换相互作用值的设备输出的旋转超流量行为。当磁性挫败感足够大，可以与易于平面各向异性竞争并无法从平面上脱离磁矩时，自旋传输会逐渐发展为扩散状态。研究了接近磁相边界的自旋超流体的鲁棒性，我们发现了{\ em近端}的自旋超流体接近铁磁过渡的可能性。
We investigate the spin transport across the magnetic phase diagram of a frustrated antiferromagnetic insulator and uncover a drastic modification of the transport regime from spin diffusion to spin superfluidity. Adopting a triangular lattice accounting for both nearest neighbor and next-nearest neighbor exchange interactions with easy-plane anisotropy, we perform atomistic spin simulations on a two-terminal configuration across the full magnetic phase diagram. We found that as long as the ground state magnetic moments remain in-plane, irrespective of whether the magnetic configuration is ferromagnetic, collinear or non-collinear antiferromagnetic, the system exhibits spin superfluid behavior with a device output that is independent on the value of the exchange interactions. When the magnetic frustration is large enough to compete with the easy-plane anisotropy and cant the magnetic moments out of the plane, the spin transport progressively evolves towards the diffusive regime. The robustness of spin superfluidity close to magnetic phase boundaries is investigated and we uncover the possibility for {\em proximate} spin superfluidity close to the ferromagnetic transition.
