近日，美国佐治亚理工学院C. A. R. Sá de Melo课题组取得一项新突破。他们提出了利用双色晶格中的自旋轨道耦合和Rabi场控制玻色-爱因斯坦凝聚体的Anderson局域化。相关研究成果已于2023年3月15日在国际学术期刊《物理评论A》上发表。

该研究团队对无序、自旋轨道耦合(SOC)和Rabi场之间的相互作用进行了理论研究，并表明SOC和Rabi场都可以被用来极大地控制双色晶格中玻色-爱因斯坦凝聚的Anderson局域化程度。研究人员在SOC和Rabi场平面上获得了不同无序强度的基态相图，并使用与³⁹K相容的实际实验参数。他们发现，在固定无序和SOC (Rabi场)的情况下，Rabi场(SOC)可以降低局域化的阈值并控制局域化长度。此外，还证明了在固定无序和Rabi场情况下，基态波函数的范围在SOC中呈周期性，导致强局域化和弱局域化的交替区域随SOC的变化而变化。

最后，研究人员描述了在固定无序和SOC的情况下，调节Rabi场会导致强局域峰的例子。

附：英文原文

Title: Controlling Anderson localization of a Bose-Einstein condensate via spin-orbit coupling and Rabi fields in bichromatic lattices

Author: Bar Alluf, C. A. R. Sá de Melo

Issue&Volume: 2023/03/15

Abstract: We perform theoretical studies of the interplay between disorder, spin-orbit coupling (SOC), and Rabi fields, and show that both SOC and Rabi fields can be used to dramatically control the degree of Anderson localization of a Bose-Einstein condensate in bichromatic lattices. We obtain ground-state phase diagrams in the SOC and Rabi field plane for different values of disorder strength and use realistic experimental parameters compatible with ³⁹K. We find cases of fixed disorder and SOC (Rabi field), where the Rabi field (SOC) reduces the threshold for localization and controls the localization length. We also show regimes of fixed disorder and Rabi field, where the extent of the ground-state wave function is periodic in the SOC, leading to alternating regions of stronger and weaker localization as SOC changes. Lastly, we describe examples of fixed disorder and SOC, where tuning the Rabi field leads to a strong localization peak.

DOI: 10.1103/PhysRevA.107.033312

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.033312