A step for gauge fields in lattices and a twist by Dissipation ( Prof. Tilman Esslinger)
A step for gauge fields in lattices and a twist by Dissipation
- Date: Nov 19, 2019
- Time: 02:30 PM (Local Time Germany)
- Speaker: Prof. Tilman Esslinger
- ETH Zürich, Switzerland
- Location: Max Planck Institute of Quantum Optics
- Room: Herbert Walther Lecture Hall
I will report on a scheme realizing
the fundamental ingredient for a density-dependent gauge field by
engineering non-trivial Peierls phases that depend on the site occupation
of fermions in a Hubbard model. [F. Görg, K. Sandholzer,
J. Minguzzi, R. Desbuquois, M. Messer, and T. Esslinger, Nat. Phys. https://doi.org/10.1038/s41567-019-0615-4(2019).].
Dissipative and unitary processes define the evolution of a many-body
system. We discovered a non-stationary state of chiral nature in a
synthetic many-body system with independently controllable unitary
and dissipative couplings. Our experiment is based on a spinor Bose
gas interacting with an optical resonator. Orthogonal quadratures of the
resonator field coherently couple the Bose-Einstein condensate to two different atomic
spatial modes whereas the dispersive effect of the resonator losses
mediates a dissipative coupling between these modes. In a regime of
dominant dissipative coupling we observe a chiral evolution
with regimes reminiscent of limit cycles [N. Dogra, M. Landini, K.
Kroeger, L. Hruby, T. Donner, and T. Esslinger, arXiv:1901.05974].