Hannover 2020 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 13: Posters: Quantum Optics and Photonics I
Q 13.4: Poster
Montag, 9. März 2020, 16:30–18:30, Empore Lichthof
Spinor BEC coupled to an optical cavity: from the Dicke model to spin textures and dissipation induced instabilities — •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
In the past decade, the driven-dissipative Dicke model has been realized and extensively studied by coupling a Bose-Einstein condensate (BEC) to an off-resonant laser field and a high-finesse optical cavity. In this poster, I will present our recent experimental results where we have extended this scheme to a spinor BEC allowing us to introduce strong opto-magnetical effects in the system and go beyond the Dicke model. Specifically, by starting with a mixture of two spin states, we identify two qualitatively new regimes. First, a spin texture with spatially modulated magnetization arises as a result of coherent opto-magnetic coupling in the system. Second, the dispersive effect of the resonator losses mediates a dissipative coupling in the system which results in a non-stationary state of chiral nature. Our system provides a model example where both coherent and dissipative regimes are independently realized and furthermore, the transition boundary between the two regimes can be explored.