Berlin 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HL: Fachverband Halbleiterphysik
HL 21: Heterostructures, Interfaces and Surfaces I
HL 21.4: Talk
Tuesday, March 19, 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