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Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 58: Quantum gases (Bosons) V

Q 58.2: Vortrag

Freitag, 13. März 2020, 11:30–11:45, e214

Multimode cavity QED description of photonic Bose--Einstein condensation — •David Steinbrecht1, Robert Bennett1,2, and Stefan Yoshi Buhmann1,21University 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.

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