Circular polarization reversal of half-vortex cores in polariton condensates
| Autor: | Stefan Schumacher, Matthias Pukrop, Xuekai Ma |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Angular momentum Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Linear polarization Rotational symmetry FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Vortex Excited state 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Polariton 010306 general physics 0210 nano-technology Quantum Circular polarization |
| DOI: | 10.48550/arxiv.1907.10974 |
| Popis: | Vortices are topological objects carrying quantized orbital angular momentum and have been widely studied in many physical systems for their applicability in information storage and processing. In systems with spin degree of freedom the elementary excitations are so called half-vortices, carrying a quantum rotation only in one of the two spin components. We study the spontaneous formation and stability of localized such half-vortices in semiconductor microcavity polariton condensates, non-resonantly excited by a linearly polarized ring-shaped pump. The TE-TM splitting of optical modes in the microcavity system leads to an effective spin-orbit coupling, resulting in solutions with discrete rotational symmetry. The cross-interaction between different spin components provides an efficient method to realize all-optical half-vortex core switching inverting its circular polarization state. This switching can be directly measured in the polarization resolved intensity in the vortex core region and it can also be applied to higher order half-vortex states. Comment: 8 pages, 8 figures |
| Databáze: | OpenAIRE |
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