Absence of heating in a uniform Fermi gas created by periodic driving
- URL: http://arxiv.org/abs/2102.09506v3
- Date: Tue, 18 Jan 2022 14:59:48 GMT
- Title: Absence of heating in a uniform Fermi gas created by periodic driving
- Authors: Constantine Shkedrov, Meny Menashes, Gal Ness, Anastasiya Vainbaum,
Ehud Altman, and Yoav Sagi
- Abstract summary: Floquet engineering can be employed to a strongly interacting Fermi gas held in a flat box-like potential without inducing excessive heating.
We measure the pair-condensation fraction at unitarity and the contact parameter across the BEC-BCS crossover.
Our results are promising for future exploration of exotic many-body phases of a bulk strongly-interacting Fermi gas with dynamically engineered Hamiltonians.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Ultracold atomic gas provides a useful tool to explore many-body physics. One
of the recent additions to this experimental toolbox is the Floquet
engineering, where periodic modulation of the Hamiltonian allows the creation
of effective potentials that do not exist otherwise. When subject to external
modulations, however, generic interacting many-body systems absorb energy, thus
posing a heating problem that may impair the usefulness of this method. For
discrete systems with bounded local energy, an exponentially suppressed heating
rate with the driving frequency has been observed previously, leaving the
system in a prethermal state for exceedingly long durations. But for systems in
continuous space, the situation remains unclear. Here we show that Floquet
engineering can be employed to a strongly interacting degenerate Fermi gas held
in a flat box-like potential without inducing excessive heating on
experimentally relevant timescales. The driving eliminates the effect of a
spin-dependent potential originating from a simultaneous magnetic levitation of
two different spin states. We calculate the heating rate and obtain a power-law
suppression with the drive frequency. To further test the many-body behavior of
the driven gas, we measure both the pair-condensation fraction at unitarity and
the contact parameter across the BEC-BCS crossover. At low driving frequencies,
the condensate fraction is reduced by the time-dependent force, but at higher
frequencies, it revives and attains an even higher value than without driving.
Our results are promising for future exploration of exotic many-body phases of
a bulk strongly-interacting Fermi gas with dynamically engineered Hamiltonians.
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