Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 46: Quantum Gases (Bosons) IV

Q 46.3: Talk

Thursday, March 14, 2019, 11:15–11:30, S HS 037 Informatik

Lasing assisted photon Bose-Einstein condensation in variable traps — •Martina Vlaho¹, Alex Leymann², Daniel Vorberg¹, and André Eckardt¹ — ¹Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — ²Istituto Nazionale di Ottica, Trento, Italy

We investigate the non-equilibrium steady state of a gas of photons in a dye-filled microcavity as it has been realized by the groups of Martin Weitz and Rob Nyman. By varying the photon cavity lifetime and the spatial distribution of the pump power, we show a transition from a quasi-equilibrium photon Bose-Einstein condensate (BEC) to an increasingly non-equilibrium situation in which a transition to a macroscopically occupied ground mode is triggered by a lasing transition in an excited mode of the system. The parameter regime for this form of lasing-assisted BEC can be extended by introducing a tilted double well potential, as it was recently introduced in the Weitz group. When the upper well is pumped, above a threshold the lasing mode ``transports" excited dye molecules into the region of the lower well, the thermalization of which eventually, for sufficiently strong pumping, causes ground-state condensation.