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HL: Fachverband Halbleiterphysik
HL 23: Ultra-fast phenomena
HL 23.3: Vortrag
Dienstag, 17. März 2020, 10:00–10:15, POT 112
Optical Vortex Core Switching in Polariton Condensates — •Matthias Pukrop1, Stefan Schumacher1,2, and Xuekai Ma1 — 1Department of Physics and CeOPP, Paderborn University, Paderborn, Germany — 2College of Optical Sciences, University of Arizona, Tucson, AZ 85721, USA
Vortices are topological objects carrying quantized orbital angular momentum, also known as topological charge, and have been widely studied in many physical systems. In those with spin degree of freedom the elementary excitations are so called half-vortices (HVs), referring to a vortex state carrying a topological charge in only one circular polarization component. Here we demonstrate the existence of localized half-vortices in spinor polariton condensates, non-resonantly excited by a linearly polarized ring-shaped pump [1,2]. In the core region of the half-vortex the condensate is circularly polarized, while it is linearly polarized elsewhere. With TE-TM splitting, the pseudospin structure of the condensate gives rise to solutions with broken cylindrical symmetry. The attractive cross-interaction between different spin components can be used to realize optical vortex core switching between left- and right-circularly polarized HV states [1]. This switching process reverses the circular polarization in the HV core. It can be easily detected by measuring the polarization resolved intensity in the vortex core region. The same method can also be applied to higher order states, enabling multi-level switching configurations.
[1] M. Pukrop et al., arXiv:1907.10974 (2019).
[2] X. Ma et al., Physical Review Letters 121, 227404 (2018).