Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Poster Session: Correlated Electrons 2
TT 20.15: Poster
Montag, 20. März 2017, 15:00–19:00, P2-OG1
Reservoir-induced Collapse and Revival of Photon BEC Oscillations — •Bastian Havers, Tim Lappe, and Johann Kroha — Physikalisches Institut, Universität Bonn, Germany
A true photon Bose-Einstein condensate (BEC) was first realized in 2010 [1] by filling a dense photon gas into a dye-filled, optical microcavity by means of a laser and subsequently thermalizing it at room temperature. Most recently, the dynamics is being investigated by means of Josephson oscillations of the photon BEC in double-well potential traps. It is characterized by a collapse and revival of Josephson oscillations. We develop the theory for the photon BEC dynamics, coupled to the dye. The ensemble of dye molecules is described as a structured, dissipative bath of three-level systems, involving three different processes, photon absorption with absorption rate 1/τa, dark transitions, and photon re-emission with emission rate 1/τe. The BEC dynamics is treated on the Gross-Pitaevskii level in a two-mode approximation for the BECs in the two potential wells [2].
[1] J. Klaers, J. Schmitt, F. Vewinger, and M. Weitz,
[1] Nature 468, 545 (2010).
[2] A. Smerzi, S. Fantoni, S. Giovanazzi, and S. R. Shenoy,
[2] Phys. Rev. Lett. 79, 4950 (1997)