Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 21: Heterostructures, Interfaces and Surfaces I

HL 21.4: Vortrag

Dienstag, 19. März 2024, 10:15–10:30, EW 561

Realization of the Topological Pseudospin-Hall Effect in an Exciton-Polariton Elliptical Micropillar Chain — •Simon Widmann, Jonas Bellmann, Johannes Düreth, Siddhartha Dam, Christian G. Mayer, Philipp Gagel, Simon Betzold, Monika Emmerling, Sven Höfling, and Sebastian Klembt — Julius-Maximilians-Universität Würzburg, Physikalisches Institut and Würzburg-Dresden Cluster of Excellence ct.qmat, Lehrstuhl für Technische Physik

We realize the topological pseudospin-Hall effect in a chain of elliptical exciton-polariton micropillars, using the different circular polarizations σ_± as a pseudospin [1]. Elliptical micropillars are fabricated by fully etching a GaAs microcavity, creating a large confinement potential. The ellipticity of the micropillars leads to a linear polarization splitting along the semi-minor and major axis of the individual elliptical micropillars. In combination with a suitable placement into a lattice, this produces a system in which positive and negative momentum states have opposing circular polarizations. This experimental demonstration is a step towards the realization of the non-Hermitian skin effect in a chain of coupled elliptical micropillars.

[1] S. Mandal et al., ACS Photonics 9, 527-539 (2022)

Keywords: Semiconductor Microcavity; Exciton-Polariton; Polariton Lasing; Elliptical Micropillars; Topological Pseudospin-Hall Effect