多晶涡旋晶格中的畴壁运动
Domain wall motion in a polycrystalline vortex lattice
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中文总结 AI 辅助
研究超导岛阵列中涡旋运动，通过调整磁场引入无序，施加电流驱动涡旋，观察到两步去钉扎转变，与模拟比较表明该状态与多晶涡旋晶格中畴壁运动一致，证明相关涡旋系统倾向界面物理而非均匀玻璃态动力学。
中文摘要 AI 辅助
无序从根本上重塑了晶体系统对外力的响应方式，但尚不清楚无序是会使相互作用的晶格趋向玻璃态，还是将它们分裂成由移动界面分隔的畴。在此，我们研究超导岛阵列中的涡旋运动，通过调整磁场使其偏离相称的涡旋填充来以可控方式引入无序。通过施加电流驱动涡旋，我们在非相称填充处观察到两步去钉扎转变。与分子涡旋模型模拟的比较表明，这种中间状态与多晶涡旋晶格中的畴壁运动一致，并证明了具有强周期性钉扎的无序、相互作用涡旋系统更倾向于界面物理而非均匀玻璃态动力学。
英文摘要
Disorder fundamentally reshapes how crystalline systems respond to external forces, yet it remains unclear whether disorder drives interacting lattices toward glassy states or instead fragments them into domains separated by mobile interfaces. Here, we investigate vortex motion in superconducting island arrays, where disorder is introduced in a controlled manner by tuning the magnetic field away from commensurate vortex fillings. By driving vortices with an applied current, we observe a two-step depinning transition at incommensurate fillings. Comparison with molecular vortex model simulations shows that this intermediate regime is consistent with domain wall motion in a polycrystalline vortex lattice. While two-step depinning has been explored theoretically in driven periodic systems, direct experimental evidence linking this behavior to interface-dominated vortex motion has been lacking. Our results demonstrate that disordered, interacting vortex systems with strong periodic pinning can favor interface physics over homogeneous glassy dynamics.
