光晶格中高自旋费米子的大振幅超交换
Large-Amplitude Superexchange of High-Spin Fermions in Optical Lattices
摘要：
我们发现，费米高自旋系统与自旋变化的碰撞允许监测超交换过程中的光学超晶格与大振幅和强自旋波动。通过对非平衡态动力学的研究，我们发现在弱相互作用下，超交换占主导地位。其基本机制是由浅阱势中出现的隧穿能隙驱动的。因此，预期仅在深晶格中发生的强相互作用的相互作用能隙被重新建立。通过调节光晶格的深度，可以忽略不计的粒子数波动的两个制度之间的交叉被发现：第一，在深晶格中的自旋波动消失的共同制度，第二，在浅晶格中的强自旋波动的一个新的制度。我们讨论了超冷40K原子在双阱和二维格斑中的可能实验实现和可观测量。
英文摘要：
We show that fermionic high-spin systems with spin-changing collisions allow to monitor superexchange processes in optical superlattices with large amplitudes and strong spin fluctuations. By investigating the non-equilibrium dynamics, we find a superexchange dominated regime at weak interactions. The underlying mechanism is driven by an emerging tunneling-energy gap in shallow few-well potentials. As a consequence, the interaction-energy gap that is expected to occur only for strong interactions in deep lattices is reestablished. By tuning the optical lattice depth, a crossover between two regimes with negligible particle number fluctuations is found: first, the common regime with vanishing spin-fluctuations in deep lattices and, second, a novel regime with strong spin fluctuations in shallow lattices. We discuss the possible experimental realization with ultracold 40K atoms and observable quantities in double wells and two-dimensional plaquettes.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
