论文标题
量子步行与经典波：通过时空动力学区分量子磁铁的基态
Quantum walk versus classical wave: Distinguishing ground states of quantum magnets by spacetime dynamics
论文作者
论文摘要
我们研究了在原型二维铁磁和抗铁磁量量子自旋系统中单个自旋翻转后的波袋扩散。我们发现特征性的空间镁密度曲线：尽管量子步行者所展示的是反映基础晶格结构的方形图案，而抗fiferromagnet则显示出圆形的图案，显示了一个圆形的图案，该图案隐藏着晶格结构，而相反类似于经典的波浪模式。我们将这些根本不同的行为追溯到截然不同的磁通能量分散关系，还提供了真实的解释。我们的发现指出了材料科学和量子模拟器中量子磁体实时，真实空间成像的新机会。
We investigate the wavepacket spreading after a single spin flip in prototypical two-dimensional ferromagnetic and antiferromagnetic quantum spin systems. We find characteristic spatial magnon density profiles: While the ferromagnet shows a square-shaped pattern reflecting the underlying lattice structure, as exhibited by quantum walkers, the antiferromagnet shows a circular-shaped pattern which hides the lattice structure and instead resembles a classical wave pattern. We trace these fundamentally different behaviors back to the distinctly different magnon energy-momentum dispersion relations and also provide a real-space interpretation. Our findings point to new opportunities for real-time, real-space imaging of quantum magnets both in materials science and in quantum simulators.
