近日，哥伦比亚卡塔赫纳大学的Luis E. Young-S与巴西圣保罗州立大学的S. K. Adhikari合作并取得一项新进展。经过不懈努力，他们探究了偶极超固体的偶极模和剪刀模振荡行为。相关研究成果已于2023年5月30日在国际知名学术期刊《物理评论A》上发表。

该研究团队探究了谐振势阱中偶极超固体的偶极模和剪切模振荡行为。这些超固体由排列在一维或二维晶格上的偶极滴状粒子组成，采用超越平均场模型，其中包括Lee-Huang-Yang相互作用，以确定其晶体结构在平移和旋转下的稳定性。偶极原子在z方向极化，而超固体的晶体结构位于x-y平面上。在准一维和准二维偶极超固体中，都存在稳定的偶极模振荡。然而，在准一维偶极超固体中，剪切模振荡只能在势阱在x-y平面上的各向异性达到最大和最小之间持续进行。

在这两种情况下，偶极超固体的晶体结构在振荡过程中未发生明显变形。剪切模振荡频率的理论估计与实验结果非常吻合，随着超固体中滴状粒子数量的增加和限制势阱频率的增加，吻合度进一步提高。这项研究的结果可通过现有技术进行实验验证。

附：英文原文

Title: Dipole-mode and scissors-mode oscillations of a dipolar supersolid

Author: Luis E. Young-S, S. K. Adhikari

Issue&Volume: 2023/05/30

Abstract: We study dipole-mode and scissors-mode oscillations of a harmonically trapped dipolar supersolid, composed of dipolar droplets arranged on a one-dimensional (1D) or a 2D lattice, to establish the robustness of its crystalline structure under translation and rotation, using a beyond-mean-field model including a Lee-Huang-Yang interaction. The dipolar atoms are polarized in the z direction with the supersolid crystalline structure lying in the x-y plane. A stable dipole-mode oscillation is possible in the case of both quasi-1D and quasi-2D dipolar supersolids, whereas a sustained angular scissors-mode oscillation is possible only in the case of a quasi-1D dipolar supersolid between a maximum and a minimum of trap anisotropy in the x-y plane. In both cases there is no visible deformation of the crystalline structure of the dipolar supersolid during the oscillation. The theoretical estimate of the scissors-mode-oscillation frequency is in good agreement with the present results and the agreement improves with an increase in the number of droplets in the supersolid and also with an increase in the confining trap frequencies. The results of this study can be tested experimentally with present knowhow.

DOI: 10.1103/PhysRevA.107.053318

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.107.053318