Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 21: Optical Properties 1

HL 21.9: Talk

Wednesday, September 7, 2022, 17:30–17:45, H32

Dynamics of phase defects trapped in optically imprinted or- bits in dissipative binary polariton condensates — •Jan Wingenbach, Matthias Pukrop, Stefan Schumacher, and Xuekai Ma — Physics Department and CeOPP, Paderborn University, Germany

Polaritons are quasiparticles, formed due to the strong coupling of photons and excitons in planar semiconductor microcavities. In polariton condensates, quantized vortices can form, which makes them promising candidates for novel quantum technological devices [1]. By nonresonant excitation of the condensate, periodic potentials can be generated, which can be used to trap vortices and stabilize phase defects, so-called dark solitons [2]. We study the dynamics of phase defects trapped in a finite, optically imprinted ring lattice in binary polariton condensates. Depending on their topological charge a Magnus force leads to the circulation of vortices in these orbits. This is investigated considering the cross interaction (CI) between the condensates in different spin components and the spin-orbit interaction (SOI). We observe elongated vortices and frozen phase defects, which resemble dark solitons showing finite size in both spin components. When the entire orbit is occupied, a snake instability is triggered, leading to the decay of the dark ring solution. In our system, the motion of vortex constellations is affected by the SOI. [1] X. Ma, et al., Nature Communications 11, 1 (2020). [2] X. Ma, et al., Phys. Rev. Lett. 118, 157401 (2017).