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Q: Fachverband Quantenoptik und Photonik
Q 35: Quantum States of Light
Q 35.5: Talk
Wednesday, March 13, 2024, 15:45–16:00, HS 3118
Photon Bose–Einstein Condensate in a Planar Cavity in the Thermodynamic Limit — •Andris Erglis1 and Stefan Yoshi Buhmann2 — 1University of Freiburg, Freiburg, Germany — 2University of Kassel, Kassel, Germany
It has been of general interest to explore the different behaviour of a Bose–Einstein condensate (BEC) for finite versus infinite systems. For instance, the critical number of particles in two dimensions diverges in the thermodynamic limit, while being well-defined for a system of finite size.
We are investigating the photon BEC inside a two dimensional planar cavity at the crossover between finite and infinite size, where our control parameter is the transversal mode spacing. In addition to the usual primary condensation threshold, we observe arrested condensation and an emergence of a second critical threshold proportional to the mode spacing, where the condensate is forming. This result, which we have derived using an analytical two-mode solutions, is corroborated by numerical simulations for larger mode numbers.
Keywords: Bose-Einstein condensate; Bosons; Quantum Optics; Cavity physics; Photon Bose-Einstein condensate