Bulletin of the American Physical Society
55th Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Monday–Friday, June 3–7, 2024; Fort Worth, Texas
Session X08: Degenerate Fermi Gases
8:00 AM–10:00 AM,
Friday, June 7, 2024
Room: 203B
Chair: Chih-Chun Chien, University of California, Merced
Abstract: X08.00002 : Probing the Higgs-amplitude mode from weakly to strongly interacting superfluids
8:12 AM–8:24 AM
Presenter:
Cesar R. C Cabrera Cordova
(University of Hamburg - Institute for Quantum Physics)
Authors:
Cesar R. C Cabrera Cordova
(University of Hamburg - Institute for Quantum Physics)
Hauke Biss
(University of Hamburg)
René Henke
(University of Hamburg - Institute for Quantum Physics)
Henning Moritz
(University of Hamburg)
that evolves from a Cooper pair to a bosonic diatomic molecule. In these phases, the U(1) phase-symmetry spontaneously breaks, giving rise to two distinct collective excitations: the Nambu-Goldstone (phase) mode and the massive Higgs (amplitude) mode. Understanding Higgs-type excitations is essential in comprehending quantum many-body systems, and addressing their stability in the absence of particle-hole symmetry, which is lost during the crossover, has long been a fundamental question. Here we show that an ultracold quasi-2D Fermi gas exhibits a long-lived excitation of the bosonic field throughout the entire crossover. Spectroscopic analysis via trapping modulation reveals a well-defined Higgs-amplitude mode on the BCS side located at the pairing gap energy 2Δ. As we approach the strongly correlated regime, this amplitude mode smoothly transitions into a coherent breathing-like excitation of the bosonic field along the confined direction. The mode resonance broadens with increasing temperature and becomes overdamped close to the critical temperature. Experimental
evidence, supported by an effective field theory indicates that the bosonic excitation maps into a non-relativistic to relativistic harmonic oscillator, transitioning from a Gross-Pitaevskii to a Klein-Gordon energy functional. This work provides an approach to simulate relativistic quantum field theories in a quantum simulator.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700