Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 58: Quantum gases (Bosons) V
Q 58.2: Talk
Friday, March 13, 2020, 11:30–11:45, e214
Multimode cavity QED description of photonic Bose--Einstein condensation — •David Steinbrecht1, Robert Bennett1,2, and Stefan Yoshi Buhmann1,2 — 1University of Freiburg, Germany — 2Freiburg Institute for Advanced Studies (FRIAS), Germany
Bose--Einstein condensation of photons has recently been observed experimentally [1]. In a laser-driven, dye-filled cavity photons thermalise to the dye temperature by multiple absorption and re-emission processes and subsequently undergo Bose--Einstein condensation. We use an open quantum systems approach [2] to describe the molecule-light interactions. Allowing for mechanisms to lift the degeneracy between cavity modes of different polarisations, we predict symmetry-breaking effects [3].
In this talk we will give a brief overview of the model and show solutions to the rate equations for the occupation numbers of the cavity modes. Condensation occurs when the pumping rate surpasses a critical threshold and the lowest-energy state becomes macroscopically occupied.
[1] J. Klaers et al., Nature 468, 545-548 (2010).
[2] P. Kirton and J. Keeling, Phys. Rev. A 91, 033826 (2015).
[3] R. Bennett, Y. Gorbachev, S. Y. Buhmann, arXiv quant-ph:1905.07590.