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

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)]. 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.

9 pages, 8 figures; to appear in Phys. Rev. A

References in corpus (20)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Theory of ultracold Fermi gases
• Amplitude / Higgs Modes in Condensed Matter Physics
• The `Higgs' Amplitude Mode at the Two-Dimensional Superfluid-Mott Insulator Transition
• Degenerate Fermi Gases of Ytterbium
• Synchronization in the BCS Pairing Dynamics as a Critical Phenomenon
• The Higgs Mode in Disordered Superconductors Close to a Quantum Phase Transition
• Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering
• Nonequilibrium dynamics and thermodynamics of a degenerate Fermi gas across a Feshbach resonance
• Collective emission of matter-wave jets from driven Bose-Einstein condensates
• Higgs mode in a strongly interacting fermionic superfluid
• Nonequilibrium dynamics of weakly and strongly paired superconductors
• Large Amplitude Dynamics of the Pairing Correlations in a Unitary Fermi Gas
• Direct observation of the Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point
• Emergent parametric resonances and time-crystal phases in driven BCS systems
• Theory of nonequilibrium dynamics of multiband superconductors
• A long-lived Higgs mode in a two-dimensional confined Fermi gas
• Spectral fingerprints of the non-linear dynamics of driven superconductors with dissipation
• Dynamical Response of Fermi Condensate to Varying Magnetic Fields

Cited by in corpus (4)

• Generation and decay of Higgs mode in a strongly interacting Fermi gas
• Exciting the Higgs mode in a strongly-interacting Fermi gas by interaction modulation
• Spectrum of density, spin and pairing fluctuations of an attractive two-dimensional Fermi gas
• Local Non-Hermitian Hamiltonian Formalism for Dissipative Fermionic Systems and Loss-Induced Population Increase in Fermi Superfluids