Dresden 2020 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 76: Poster IIIC
HL 76.11: Poster
Thursday, March 19, 2020, 15:00–17:30, P2/4OG
Multistable circular currents of polariton condensates trapped in ring potentials — •Franziska Barkhausen1, Stefan Schumacher1,2, and Xuekai Ma1 — 1Department of Physics and CeOPP, Universität Paderborn, Paderborn, Germany — 2College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA
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 planar semiconductor microcavities vortices can be supported and trapped by a ring-shaped potential, for example optically induced using spatially structured non-resonant excitation [1,2]. Here we theoretically study vortices excited non-resonantly in a fabricated ring-shaped external potential. This kind of potential traps the polariton condensate such that different steady-state solutions, oscillating or rotating solutions can be formed, depending on the width and depth of the potential. For a narrow and shallow potential, multistable ring solutions can be stabilized carrying different orbital angular momenta (OAM) but the same ring-shaped density structure. By increasing the confinement of the potential, a higher mode together with the fundamental mode can be excited. Their beating generates an oscillating solution if they have the same OAM or a spatially rotating solution if they have different OAM.
[1] X. Ma and S. Schumacher, Phys. Rev. Lett. 121, 227404 (2018).
[2] X. Ma et al., arXiv: 1907.03171 (2019).