Observing dynamical currents in a non-Hermitian momentum lattice
- URL: http://arxiv.org/abs/2108.11888v2
- Date: Wed, 30 Mar 2022 11:11:05 GMT
- Title: Observing dynamical currents in a non-Hermitian momentum lattice
- Authors: Rodrigo Rosa-Medina, Francesco Ferri, Fabian Finger, Nishant Dogra,
Katrin Kroeger, Rui Lin, R. Chitra, Tobias Donner, Tilman Esslinger
- Abstract summary: Collective tunneling is implemented via cavity-assisted Raman scattering of photons by a spinor Bose-Einstein condensate into an optical cavity.
We observe that the individual tunneling events are superradiant in nature and locally resolve them in the lattice.
Results can be extended to a regime exhibiting a cascade of currents and simultaneous coherences between multiple lattice sites.
- Score: 1.4292032980797766
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: We report on the experimental realization and detection of dynamical currents
in a spin-textured lattice in momentum space. Collective tunneling is
implemented via cavity-assisted Raman scattering of photons by a spinor
Bose-Einstein condensate into an optical cavity. The photon field inducing the
tunneling processes is subject to cavity dissipation, resulting in effective
directional dynamics in a non-Hermitian setting. We observe that the individual
tunneling events are superradiant in nature and locally resolve them in the
lattice by performing real-time, frequency-resolved measurements of the leaking
cavity field. The results can be extended to a regime exhibiting a cascade of
currents and simultaneous coherences between multiple lattice sites, where
numerical simulations provide further understanding of the dynamics. Our
observations showcase dynamical tunneling in momentum-space lattices and
provide prospects to realize dynamical gauge fields in driven-dissipative
settings.
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