Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 3: Photonics I

Q 3.6: Vortrag

Montag, 10. März 2025, 12:30–12:45, HS Botanik

Exciton-Polariton Artificial Gauge Field Topological Pseudospin Hall Effect — •Simon Widmann, Jonas Bellmann, Johannes Düreth, Siddhartha Dam, Christian G. Mayer, Philipp Gagel, Simon Betzold, Monika Emmerling, Sven Höfling, and Sebastian Klembt — Technische Physik and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

We explore the interplay of artificial gauge fields and synthetic dimensions in a chain of coupled elliptical exciton-polariton micropillars, leveraging polariton circular polarization to achieve pseudospin-dependent propagation. The elliptical micropillars, fabricated by etching a GaAs microcavity, exhibit a linear polarization splitting due to their geometry. By carefully engineering the lattice geometry and pillar rotations, we implement an artificial gauge field, inducing complex hopping phases that mimic the effects of a magnetic flux. This design enables pseudospin-dependent propagation: polaritons with opposing circular polarizations travel in opposite directions leading to a Hamiltonian that gives rise to the quantum Hall effect. We introduce an artificial dimension, mapping the effectively 1D chain to a 2D square lattice. Our results highlight the potential of exciton-polaritons as a versatile platform for investigating topological photonics, non-Hermitian physics, and synthetic dimensions in driven-dissipative systems, paving the way for novel approaches to quantum simulation and polaritonic devices.

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