Anisotropic exciton polariton pairs as a platform for PT-symmetric non-Hermitian physics

• URL: http://arxiv.org/abs/2305.17472v2
• Date: Wed, 31 May 2023 07:32:54 GMT
• Title: Anisotropic exciton polariton pairs as a platform for PT-symmetric non-Hermitian physics
• Authors: Devarshi Chakrabarty, Avijit Dhara, Pritam Das, Kritika Ghosh, Ayan Roy Chaudhuri, Sajal Dhara
• Abstract summary: We show how microcavity exciton-polaritons can offer a versatile platform for realizing multiple spectral degeneracies. It will be critical for realizing zero threshold lasers.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Non-Hermitian systems with parity-time (PT) symmetry have been realized using optical constructs in the classical domain, leading to a plethora of non-intuitive phenomena. However, PT-symmetry in purely quantum non-Hermitian systems like microcavity exciton-polaritons has not been realized so far. Here we show how a pair of nearly orthogonal sets of anisotropic exciton-polaritons can offer a versatile platform for realizing multiple spectral degeneracies called Exceptional Points (EPs) and propose a roadmap to achieve a PT-symmetric system. Polarization-tunable coupling strength creates one class of EPs, while Voigt EPs are observed for specific orientations where splitting of polariton modes due to birefringence is compensated by Transverse Electric (TE) -Transverse Magnetic (TM) mode splitting. Thus, paired sets of polarized anisotropic microcavity exciton-polaritons can offer a promising platform not only for fundamental research in non-Hermitian quantum physics and topological polaritons, but also, we propose that it will be critical for realizing zero threshold lasers.

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