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

• URL: http://arxiv.org/abs/2210.09829v1
• Date: Tue, 18 Oct 2022 13:18:24 GMT
• Title: Exciting long-lived Higgs mode in superfluid Fermi gases with particle removal
• Authors: Guitao Lyu, Kui-Tian Xi, Sukjin Yoon, Qijin Chen, and Gentaro Watanabe
• Abstract summary: We study how to excite long-lived Higgs-mode oscillations in a homogeneous superfluid Fermi gas. We find that the Higgs mode can be excited by time-periodically modulating the scattering length at an appropriate amplitude and frequency. More importantly, we find that persistent Higgs-mode oscillations with almost constant amplitude can be produced by removing particles at an appropriate momentum.
• Score: 2.6057063141676573
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Experimental evidence of the Higgs mode in strongly interacting superfluid Fermi gases has not been observed until not long ago [A. 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 of experimental realization of particle removal.

Related papers

• Decoupled sound and amplitude modes in trapped dipolar supersolids [0.0]
  We show how decoupled first sound, second sound, and Higgs modes emerge by following their origin from superfluid modes across the transition. Our results unify previous notions of coupled Goldstone and Higgs modes in harmonic traps.
  arXiv  Detail & Related papers  (2024-04-18T17:59:41Z)
• Discovery of an Unconventional Quantum Echo by Interference of Higgs Coherence [0.6364409691582438]
  A terahertz pulse-pair modulation of the superconducting gap generates a "time grating" of coherent Higgs population. These manifestations appear as Higgs echo spectral peaks occurring at frequencies forbidden by equilibrium particle-hole symmetry. The Higgs interference and anharmonicity control the decoherence of driven superconductivity.
  arXiv  Detail & Related papers  (2023-12-18T03:39:17Z)
• Enhancement of long-wave vibronic interaction and quantum diffusion in liquids [55.2480439325792]
  The zero-phonon type hoping motion of defects in the solid and liquid phases, causing quantum diffusion, is considered. It was found that due to the previously discovered significant enhancement of vibronic interaction with long-wave acoustic phonons, this motion in liquids can be significantly amplified.
  arXiv  Detail & Related papers  (2023-12-04T15:44:04Z)
• Observation and quantification of pseudogap in unitary Fermi gases [13.227049854625527]
  We report the observation of the long-sought pair-fluctuation-driven pseudogap in homogeneous unitary Fermi gases of lithium-6 atoms. The inverse pair lifetime exhibits a thermally-activated exponential behavior, uncovering the microscopic virtual pair breaking and recombination mechanism. Our findings quantitatively characterize the pseudogap in strongly-interacting Fermi gases, highlighting the role of preformed pairing as a precursor to superfluidity.
  arXiv  Detail & Related papers  (2023-10-21T14:35:36Z)
• The strongly driven Fermi polaron [49.81410781350196]
  Quasiparticles are emergent excitations of matter that underlie much of our understanding of quantum many-body systems. We take advantage of the clean setting of homogeneous quantum gases and fast radio-frequency control to manipulate Fermi polarons. We measure the decay rate and the quasiparticle residue of the driven polaron from the Rabi oscillations between the two internal states.
  arXiv  Detail & Related papers  (2023-08-10T17:59:51Z)
• Quantum vibrational mode in a cavity confining a massless spinor field [91.3755431537592]
  We analyse the reaction of a massless (1+1)-dimensional spinor field to the harmonic motion of one cavity wall. We demonstrate that the system is able to convert bosons into fermion pairs at the lowest perturbative order.
  arXiv  Detail & Related papers  (2022-09-12T08:21:12Z)
• Quantum Coherence Tomography of Lightwave Controlled Superconductivity [0.06364409691582436]
  Lightwave periodic driving of nearly dissipation-less currents has recently emerged as a universal control concept for superconducting (SC) and topological electronics applications. We report the discovery of lightwave-controlled superconductivity via parametric time-periodic driving of strongly-coupled bands in iron-based superconductors. We are able to measure non-perturbative, high-order correlations in this strongly-driven superconductivity by separating the THz multi-dimensional coherent spectra into conventional pump-probe, Higgs collective mode, and pronounced bi-Higgs frequency sideband peaks with highly nonlinear field dependence.
  arXiv  Detail & Related papers  (2022-07-13T04:31:34Z)
• Dynamics of Transmon Ionization [94.70553167084388]
  We numerically explore the dynamics of a driven transmon-resonator system under strong and nearly resonant measurement drives. We find clear signatures of transmon ionization where the qubit escapes out of its cosine potential.
  arXiv  Detail & Related papers  (2022-03-21T18:00:15Z)
• Higgs mode stabilization by photo-induced long-range interactions in a superconductor [0.3437656066916039]
  We show that excitations of a 2D BCS superconductor are significantly altered when coupled to an externally driven cavity. We find that they combine non-linearly with intrinsic local interactions to increase the Bogoliubov quasiparticle excitation energies.
  arXiv  Detail & Related papers  (2021-06-09T13:53:04Z)
• Visualizing spinon Fermi surfaces with time-dependent spectroscopy [62.997667081978825]
  We propose applying time-dependent photo-emission spectroscopy, an established tool in solid state systems, in cold atom quantum simulators. We show in exact diagonalization simulations of the one-dimensional $t-J$ model that the spinons start to populate previously unoccupied states in an effective band structure. The dependence of the spectral function on the time after the pump pulse reveals collective interactions among spinons.
  arXiv  Detail & Related papers  (2021-05-27T18:00:02Z)
• Analog cosmological reheating in an ultracold Bose gas [58.720142291102135]
  We quantum-simulate the reheating-like dynamics of a generic cosmological single-field model in an ultracold Bose gas. Expanding spacetime as well as the background oscillating inflaton field are mimicked in the non-relativistic limit. The proposed experiment has the potential of exploring the evolution up to late times even beyond the weak coupling regime.
  arXiv  Detail & Related papers  (2020-08-05T18:00:26Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.