跨越玻色玻璃转变的量子淬火
Quantum Quenches across the Bose-glass Transition
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中文总结 AI 辅助
本研究利用光学准晶中的超冷玻色子，通过量子淬火研究超流到玻色玻璃转变的非平衡动力学，发现快速淬火引发动量空间量子行走，超流淬火形成实空间光锥结构，并揭示特征时间尺度与准无序及隧穿强度的关联。
中文摘要 AI 辅助
由于其长程有序与准无序之间的内在相互作用，准晶系统为研究新奇量子现象提供了丰富的平台。在此，我们利用光学准晶中的超冷玻色子，研究了跨越超流到玻色玻璃转变的量子淬火后的非平衡动力学。快速淬火进入玻色玻璃区域会在动量空间中引发量子行走，并扩展到越来越高的动量阶。相反，淬火进入超流区域则会引发初始局域原子的实空间量子行走，形成由Lieb-Robinson界限约束的光锥状结构。特征时间尺度揭示了与底层哈密顿量的紧密联系，并主要受玻色玻璃相中准无序强度以及超流相中隧穿强度的控制。最后，我们分析了向更深晶格的较慢淬火，并观察到跨越相变时相干性的衰减。
英文摘要
Due to their intrinsic interplay between long-range order and quasi-disorder, quasicrystalline systems provide a rich platform for investigating novel quantum phenomena. Here we study the non-equilibrium dynamics following quantum quenches across the superfluid to Bose-glass transition using ultracold bosons in an optical quasicrystal. Fast quenches into the Bose glass regime induce a quantum walk in momentum space that spreads over increasingly higher momentum orders. Conversely, quenches into the superfluid regime initiate a real-space quantum walk of initially localized atoms, forming a light-cone-like structure bounded by Lieb-Robinson limits. Characteristic timescales reveal strong links to the underlying Hamiltonian and are governed primarily by quasi-disorder strength in the Bose glass phase, and by tunneling strength in the superfluid phase. Finally, we analyze slower quenches into deeper lattices and observe the decay of coherence across the phase transition.
发表机构
- Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室）
- State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University（北京大学物理学院介观物理国家重点实验室及纳米光电前沿科学中心）
- Department of Physics, University of Strathclyde（斯特拉斯克莱德大学物理系）
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