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Exciting the long-lived Higgs mode in superfluid Fermi gases with particle removal

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Title
Exciting the long-lived Higgs mode in superfluid Fermi gases with particle removal
Author(s)
Lyu, G.; Xi, K.-T.; Sukjin Yoon; Chen, Q.; Watanabe, G.
Publication Date
2023-02
Journal
Physical Review A, v.107, no.2
Publisher
American Physical Society
Abstract
Experimental evidence of the Higgs mode in strongly interacting superfluid Fermi gases had not been observed until recently [Behrle et al., Nat. Phys. 14, 781 (2018)10.1038/s41567-018-0128-6.]. Due to the coupling with other collective modes and quasiparticle excitations, generating stable Higgs-mode oscillations is challenging. We study how to excite long-lived Higgs-mode oscillations in a homogeneous superfluid Fermi gas in the BCS-BEC crossover. We find that the Higgs mode can be excited by time-periodically modulating the scattering length at an appropriate amplitude and frequency. However, even for a modulation frequency below twice the pairing-gap energy, quasiparticles are still excited through the generation of higher harmonics due to nonlinearity in the superfluid. More importantly, we find that persistent Higgs-mode oscillations with almost constant amplitude can be produced by removing particles at an appropriate momentum, and the oscillation amplitude can be controlled by the number of removed particles. Finally, we propose two ways to experimentally realize particle removal. © 2023 American Physical Society.
URI
https://pr.ibs.re.kr/handle/8788114/13228
DOI
10.1103/PhysRevA.107.023321
ISSN
2469-9926
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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