Hannover 2020 – scientific programme

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A: Fachverband Atomphysik

A 28: Poster Session - Atomic Physics IV

A 28.35: Poster

Thursday, March 12, 2020, 16:00–18:00, Empore Lichthof

A Steady-State Bose-Einstein Condensate — •Shayne Bennetts, Chun-Chia Chen, Rodrigo Gonzalez-Escudero, Benjamin Pasquiou, and Florian Schreck — Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands

We have demonstrated a steady-state Bose-Einstein Condensate (BEC), a BEC for which losses are compensated by stimulated gain from a continuously refilled thermal reservoir surrounding the condensate. By continuously streaming a beam of strontium atoms through a sequence of laser cooling stages [1, 2] we cool the gas to 1µK while simultaneously increasing its density to reach the quantum regime. After switching the system on, steady-state is reached within 8 seconds after which we always destructively detect a BEC of ∼15000 atoms at randomly chosen times up to 5 minutes. This represents a critical step towards developing steady-state atom lasers and interferometers which may offer advantages for some applications like gravitational wave detection. The same concepts used to create a steady-state degenerate gas can also be applied to generate high phase-space density beams [3] and samples opening the door for demonstrating a continuous active optical clock on a clock transition.

[1] Bennetts et al., PRL 119, 223202 (2017). [2] Stellmer et al., PRL 110, 263003 (2013). [3] Chen et al., Phys. Rev. Applied 12, 044014 (2019).