Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 25: Quantum gases (Bosons) IV
Q 25.4: Talk
Wednesday, March 11, 2020, 11:45–12:00, e214
Dissipation induced structural instability and chiral dynamics in a quantum Gas — •Nishant Dogra1,2, Manuele Landini1,3, Katrin Kroeger1, Lorenz Hruby1, Francesco Ferri1, Rodrigo Rosa-Medina1, Fabian Finger1, Tobias Donner1, and Tilman Esslinger1 — 1Institute for Quantum Electronics, ETH Zurich, CH-8093 Zurich, Switzerland — 2Cavendish Laboratory, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom — 3Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, 6020 Innsbruck, Austria
Dissipative and unitary processes define the evolution of a many-body system. Their interplay gives rise to dynamical phase transitions and can lead to instabilities. In this talk, I will present our recent observation of 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 the chiral evolution and relate it to a positional instability.
[1] N. Dogra et al, arXiv:1901.05974 (2019).