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Exciting the Higgs Mode in a Strongly Interacting Fermi Gas by Interaction Modulation
Andreas Kell1, Moritz Breyer1, Daniel Eberz1
1Physikalisches Institut, <a href="https://ror.org/041nas322">University of Bonn</a>, Wegelerstraße 8, 53115 Bonn, Germany.
Abstract:
We study the Higgs mode of a strongly interacting Fermi gas in the crossover regime between a fermionic and bosonic superfluid. By periodically modulating the interaction strength of the gas, we parametrically excite the Higgs mode and study its resonance frequency and line width as a function of both interaction strength and temperature. We find that the resonance frequency at low temperature agrees with a local-density approximation of the pairing gap. Both frequency and line width do not exhibit a pronounced variation with temperature, which is theoretically unexpected, however, in qualitative agreement with a different recent study.
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