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
- Datum: 19.11.2019
- Uhrzeit: 14:30
- Vortragende(r): Prof. Tilman Esslinger
- ETH Zürich, Switzerland
- Ort: Max Planck Institute of Quantum Optics
- Raum: 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].