article published Jan Wingenbach author 69187 Stefan Schumacher author 272710000-0003-4042-4951 Xuekai Ma author 59416 15 department 170 department 297 department 705 department 35 department 230 department 27 department 429 department Computing Resources Provided by the Paderborn Center for Parallel Computing project TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten zu funktionellen Strukturen project TRR 142 - Project Area A project TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit Polaritonen in Mikrokavitäten project <jats:p>Exceptional points (EPs), with their intriguing spectral topology, have attracted considerable attention in a broad range of physical systems, with potential sensing applications driving much of the present research in this field. Here, we investigate spectral topology and EPs in systems with significant nonlinearity, exemplified by a nonequilibrium exciton-polariton condensate. With the possibility to control loss and gain and nonlinearity by optical means, this system allows for a comprehensive analysis of the interplay of nonlinearities (Kerr type and saturable gain) and non-Hermiticity. Not only do we find that EPs can be intentionally shifted in parameter space by the saturable gain, but we also observe intriguing rotations and intersections of Riemann surfaces and find nonlinearity-enhanced sensing capabilities. With this, our results illustrate the potential of tailoring spectral topology and related phenomena in non-Hermitian systems by nonlinearity.</jats:p> <jats:sec> <jats:title/> <jats:supplementary-material> <jats:permissions> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2024</jats:copyright-year> </jats:permissions> </jats:supplementary-material> </jats:sec> American Physical Society (APS)2024 eng 2643-156410.1103/physrevresearch.6.013148 61 @article{Wingenbach_Schumacher_Ma_2024, title={Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems}, volume={6}, DOI={<a href="https://doi.org/10.1103/physrevresearch.6.013148">10.1103/physrevresearch.6.013148</a>}, number={1013148}, journal={Physical Review Research}, publisher={American Physical Society (APS)}, author={Wingenbach, Jan and Schumacher, Stefan and Ma, Xuekai}, year={2024} } Wingenbach J, Schumacher S, Ma X. Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems. <i>Physical Review Research</i>. 2024;6(1). doi:<a href="https://doi.org/10.1103/physrevresearch.6.013148">10.1103/physrevresearch.6.013148</a> Wingenbach, Jan, et al. “Manipulating Spectral Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems.” <i>Physical Review Research</i>, vol. 6, no. 1, 013148, American Physical Society (APS), 2024, doi:<a href="https://doi.org/10.1103/physrevresearch.6.013148">10.1103/physrevresearch.6.013148</a>. Wingenbach, Jan, Stefan Schumacher, and Xuekai Ma. “Manipulating Spectral Topology and Exceptional Points by Nonlinearity in Non-Hermitian Polariton Systems.” <i>Physical Review Research</i> 6, no. 1 (2024). <a href="https://doi.org/10.1103/physrevresearch.6.013148">https://doi.org/10.1103/physrevresearch.6.013148</a>. J. Wingenbach, S. Schumacher, X. Ma, Physical Review Research 6 (2024). J. Wingenbach, S. Schumacher, and X. Ma, “Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems,” <i>Physical Review Research</i>, vol. 6, no. 1, Art. no. 013148, 2024, doi: <a href="https://doi.org/10.1103/physrevresearch.6.013148">10.1103/physrevresearch.6.013148</a>. Wingenbach, J., Schumacher, S., &#38; Ma, X. (2024). Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian polariton systems. <i>Physical Review Research</i>, <i>6</i>(1), Article 013148. <a href="https://doi.org/10.1103/physrevresearch.6.013148">https://doi.org/10.1103/physrevresearch.6.013148</a> 612572025-09-12T11:23:33Z2025-09-12T11:24:59Z