# Excitation of the dissipationless Higgs mode in a fermionic condensate

## TL;DR

This paper investigates the excitation of the Higgs mode in fermionic superfluids, demonstrating that strong coupling and dispersion effects can lead to persistent, undamped oscillations of this amplitude mode.

## Contribution

It proposes using Feshbach resonances to excite the Higgs mode in cold gases and shows that dispersion suppresses dephasing, enabling persistent oscillations.

## Key findings

- Undamped Higgs mode can be excited in fermionic superfluids.
- Weak dispersion suppresses dephasing, leading to persistent oscillations.
- Simulation results match many-body theoretical predictions.

## Abstract

The amplitude mode of a fermionic superfluid, analogous to the Higgs Boson, becomes undamped in the strong coupling regime when its frequency is pushed inside the BCS energy gap. We argue that this is the case in cold gases due to the energy dispersion and nonlocality of the pairing interaction, and propose to use the Feshbach resonance regime for parametric excitation of this mode. The results presented for the BCS pairing dynamics indicate that even weak dispersion suppresses dephasing and gives rise to persistent oscillations. The frequency of oscillations extracted from our simulation of the BCS dynamics agrees with the prediction of the many-body theory.