---
_id: '61257'
abstract:
- lang: eng
  text: "<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>\r\n
    \         <jats:sec>\r\n            <jats:title/>\r\n            <jats:supplementary-material>\r\n
    \             <jats:permissions>\r\n                <jats:copyright-statement>Published
    by the American Physical Society</jats:copyright-statement>\r\n                <jats:copyright-year>2024</jats:copyright-year>\r\n
    \             </jats:permissions>\r\n            </jats:supplementary-material>\r\n
    \         </jats:sec>"
article_number: '013148'
author:
- first_name: Jan
  full_name: Wingenbach, Jan
  id: '69187'
  last_name: Wingenbach
- first_name: Stefan
  full_name: Schumacher, Stefan
  id: '27271'
  last_name: Schumacher
  orcid: 0000-0003-4042-4951
- first_name: Xuekai
  full_name: Ma, Xuekai
  id: '59416'
  last_name: Ma
citation:
  ama: 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>
  apa: 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>
  bibtex: '@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} }'
  chicago: 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>.
  ieee: '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>.'
  mla: 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>.
  short: J. Wingenbach, S. Schumacher, X. Ma, Physical Review Research 6 (2024).
date_created: 2025-09-12T11:23:33Z
date_updated: 2025-09-12T11:24:59Z
department:
- _id: '15'
- _id: '170'
- _id: '297'
- _id: '705'
- _id: '35'
- _id: '230'
- _id: '27'
- _id: '429'
doi: 10.1103/physrevresearch.6.013148
intvolume: '         6'
issue: '1'
language:
- iso: eng
project:
- _id: '52'
  name: Computing Resources Provided by the Paderborn Center for Parallel Computing
- _id: '53'
  name: 'TRR 142: Maßgeschneiderte nichtlineare Photonik: Von grundlegenden Konzepten
    zu funktionellen Strukturen'
- _id: '54'
  name: TRR 142 - Project Area A
- _id: '61'
  name: 'TRR 142; TP A04: Nichtlineare Quantenprozesstomographie und Photonik mit
    Polaritonen in Mikrokavitäten'
publication: Physical Review Research
publication_identifier:
  issn:
  - 2643-1564
publication_status: published
publisher: American Physical Society (APS)
status: public
title: Manipulating spectral topology and exceptional points by nonlinearity in non-Hermitian
  polariton systems
type: journal_article
user_id: '16199'
volume: 6
year: '2024'
...