Pinpointing Feshbach resonances and testing Efimov universalities in 39K

被引：15

作者：

Etrych, Jiri ^{[1
]}

Martirosyan, Gevorg ^{[1
]}

Cao, Alec ^{[1
]}

Glidden, Jake A. P. ^{[1
]}

Dogra, Lena H. ^{[1
]}

Hutson, Jeremy M. ^{[2
]}

Hadzibabic, Zoran ^{[1
]}

Eigen, Christoph ^{[1
]}

机构：

[1] Univ Cambridge, Cavendish Lab, JJ Thomson Ave, Cambridge CB3 0HE, England

[2] Univ Durham, Joint Quantum Ctr Durham Newcastle, Dept Chem, South Rd, Durham DH1 3LE, England

来源：

PHYSICAL REVIEW RESEARCH | 2023年 / 5卷 / 01期

基金：

英国科学技术设施理事会; 英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

ULTRACOLD COLLISIONS; ATOMIC-COLLISIONS; COLD MOLECULES; QUANTUM GASES; SCATTERING; DYNAMICS; PHYSICS;

D O I：

10.1103/PhysRevResearch.5.013174

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using a combination of bound-state spectroscopy and loss spectroscopy, we pinpoint eight intrastate Feshbach resonances in 39K, as well as six previously unexplored interstate ones. We perform a detailed characterization of four of the intrastate resonances and two of the interstate ones. We carry out coupled-channel scattering calculations and find good agreement with experiment. The combination of experiment and theory provides a faithful map of the scattering length a and permits precision measurements of the signatures of Efimov physics across four intermediate-strength intrastate resonances. We measure the modulation of the a4 scaling of the three-body loss coefficient for both a < 0 and a > 0, as well as the many-body loss dynamics at unitarity (where a diverges). The absolute positions of the observed Efimov features confirm a ubiquitous breakdown of Efimov- van der Waals universality in 39K, while their relative positions are in agreement with the universal Efimov ratios. The loss dynamics at unitarity are the same (within experimental uncertainties) for the three broadest Feshbach resonances, consistent with observing little variation in the widths of the corresponding Efimov features.

引用

页数：12