Seminarium CeNT (21.11.2025): Supersolid Light in a Spin-Orbit Coupled Exciton-Polariton Bose-Einstein Condensate
19 11 2025
Kategoria: Aktualności CeNT, Seminaria CeNT, Strona główna
The Centre of New Technologies, University of Warsaw invites to a seminar by:
prof. Jacek Szczytko,
Faculty of Physics, University of Warsaw
Title: Supersolid Light in a Spin-Orbit Coupled Exciton-Polariton Bose-Einstein Condensate
Date: 21.11.2025, Friday
Time: 12:00 (Central European Time)
Host: prof. Michał Parniak
The seminar will be held in the 00.142 auditorium
Abstract:
Supersolidity is a peculiar state of matter, which, in addition to the superfluid behaviour of weakly interacting Bose condensates, shows a periodic modulation of its density typical for crystals and called stripe phase. We report the fabrication of an optical microcavity filled with a nematic liquid crystal (LC) sandwiched between two layers of the organic polymer MeLPPP. The structure demonstrates the formation of room-temperature exciton-polaritons in the presence of Rashba-Dresselhaus Spin-Orbit Coupling (RDSOC), which is tuned by external voltage controlling the LC birefringence. In the RDSOC regime, condensation occurs in the two distinct degenerate minima of the dispersion, as well as in the negative mass states separating them, which is a signature of the interaction between polaritons and the non-resonantly created excitonic reservoir. The condensate real space distribution shows both polarization and density stripes, characteristic for supersolid phase, which stem from the interference between the condensate components characterized by different wavevectors and polarizations [https://arxiv.org/abs/2407.02406].