Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 21: Optical Properties 1

HL 21.7: Vortrag

Mittwoch, 7. September 2022, 16:45–17:00, H32

Multistable, co- and counterflowing currents of polariton condensates in concentric ring-shaped and elliptical potentials — •Franziska Barkhausen, Matthias Pukrop, Xuekai Ma, and Stefan Schumacher — Department of Physics and CeOPP, Paderborn University, Germany

Vortices occur in a broad range of nonlinear systems. They have been widely investigated in many physical systems and different materials for their fundamental interest and for applications in data storage and information processing. In polariton condensates in semiconductor microcavities vortices can be supported and trapped by including a ring-shaped potential, for example optically induced using spatially structured non-resonant excitation [1]. Here we theoretically study vortices excited non-resonantly in different fabricated ring-shaped and elliptical external potentials. These kinds of potentials trap the polariton condensate such that different steady-state solutions, oscillating or co- and counterrotating solutions can be formed, depending on the size and number of the potential wells. A single ring potential can stabilize multistable solutions carrying different orbital angular momenta (OAM) which can lead to the beating of different modes and spatially rotating solutions. A concentric arrangement of many rings enables the excitation of Bessel-like solutions [2]. Embedding a standard ring potential in an elliptical one gives rise to phase differences of the condensates in the two rings and to counterflowing condensate currents.

[1] X. Ma, et al., Nat Commun 11, 897 (2020).

[2] F. Barkhausen, et al., Phys. Rev. B 103, 075305 (2021).