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Seminarium Fizyki Politechniki Wrocławskiej

11:15 Monday, 04-11-19
PWr, bud. A1, sala 322

Quasi-interacting, Room temperature Organic Exciton-Polariton Condensates in tailored Landscapes

dr Christian Schneider

Technische Physik and Wilhelm Conrad Röntgen-Center for Complex Material Systems, University of Würzburg, Germany

Interacting Bosonic condensates, loaded in periodic potentials have emerged as a prime system for on-chip quantum simulation, exploration of exotic quantum phases, and topological photonics. However, such experiments, which rely on a well-defined shaping of the potential landscape of the condensates, have been restricted to ultra-cold temperatures in atomic systems in laser traps, or cryogenic temperatures for exciton-polaritons in the mature GaAs platform. In our work, we present first experiments conducted on a condensate of exciton-polaritons in a lattice at ambient conditions. We utilize fluorescent proteins as an excitonic gain material, providing ultra-stable Frenkel excitons, and directly take advantage of their soft nature by mechanically shaping them in the photonic lattice environment.

I will discuss the following observations:

  • The high quality of our device allows us to generate a close-to ideal bandstructure of the lattice, arranged by tightly bound polaritonic traps.
  • The high structural quality of our material allows us to enter the regime of bosonic condensation at ambient condition in this lattice.
  • Microscopic modelling allows us to establish the fundamental understanding about polaritonic non-linearities based on Frenkel-Excitons.
  • By shaping the pump spot, we can load the condensate into distinct lattice modes and symmetries at will. This capability is a powerful tool for any sort of advanced experiments relying on collective transitions of coherent bosonic states.

im. Włodzimierza Trzebiatowskiego
Adres Instytutu:
ul. Okólna 2, 50-422 Wrocław
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71 343 5021, 71 395 4xxx (xxx nr wew.)
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Poniedziałek - piątek w godz. 7:30-15:30