Optomechanical response of a strongly interacting Fermi gas

被引：1

作者：

Helson, Victor ^{[1
,2
]}

Zwettler, Timo ^{[1
,2
]}

Roux, Kevin ^{[1
,2
,3
]}

Konishi, Hideki ^{[1
,2
,4
]}

Uchino, Shun ^{[5
]}

Brantut, Jean-Philippe ^{[1
,2
]}

机构：

[1] Ecole Polytech Fed Lausanne, Inst Phys, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, Ctr Quantum Sci & Engn, CH-1015 Lausanne, Switzerland

[3] Univ Grenoble Alpes, CEA Leti, MINATEC campus, F-38054 Grenoble, France

[4] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

[5] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai 3191195, Japan

来源：

PHYSICAL REVIEW RESEARCH | 2022年 / 4卷 / 03期

基金：

欧洲研究理事会; 瑞士国家科学基金会;

关键词：

LIGHT;

D O I：

10.1103/PhysRevResearch.4.033199

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study a Fermi gas with strong, tunable interactions dispersively coupled to a high-finesse cavity. Upon probing the system along the cavity axis, we observe a strong optomechanical Kerr nonlinearity originating from the density response of the gas to the intracavity field and measure it as a function of interaction strength. We find that the zero-frequency density response function of the Fermi gas increases by a factor of two from the Bardeen-Cooper-Schrieffer to the Bose-Einstein condensate regime. The results are in quantitative agreement with a theory based on operator-product expansion, expressing the density response in terms of universal functions of the interactions, the contact, and the internal energy of the gas. This provides an example of a driven-dissipative, strongly correlated system with a strong nonlinear response, opening up perspectives for the sensing of weak perturbations or inducing long-range interactions in Fermi gases.

引用

页数：10

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