Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/156276
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dc.contributor.authorSu, Ruien_US
dc.contributor.authorEstrecho, Eliezeren_US
dc.contributor.authorBiegańska, Dąbrówkaen_US
dc.contributor.authorHuang, Yuqingen_US
dc.contributor.authorWurdack, Matthiasen_US
dc.contributor.authorPieczarka, Maciejen_US
dc.contributor.authorTruscott, Andrew G.en_US
dc.contributor.authorLiew, Timothy Chi Hinen_US
dc.contributor.authorOstrovskaya, Elena A.en_US
dc.contributor.authorXiong, Qihuaen_US
dc.date.accessioned2022-04-16T07:49:51Z-
dc.date.available2022-04-16T07:49:51Z-
dc.date.issued2021-
dc.identifier.citationSu, R., Estrecho, E., Biegańska, D., Huang, Y., Wurdack, M., Pieczarka, M., Truscott, A. G., Liew, T. C. H., Ostrovskaya, E. A. & Xiong, Q. (2021). Direct measurement of a non-Hermitian topological invariant in a hybrid light-matter system. Science Advances, 7(45), eabj8905-. https://dx.doi.org/10.1126/sciadv.abj8905en_US
dc.identifier.issn2375-2548en_US
dc.identifier.urihttps://hdl.handle.net/10356/156276-
dc.description.abstractTopology is central to understanding and engineering materials that display robust physical phenomena immune to imperfections. Different topological phases of matter are characterized by topological invariants. In energy-conserving (Hermitian) systems, these invariants are determined by the winding of eigenstates in momentum space. In non-Hermitian systems, a topological invariant is predicted to emerge from the winding of the complex eigenenergies. Here, we directly measure the non-Hermitian topological invariant arising from exceptional points in the momentum-resolved spectrum of exciton polaritons. These are hybrid light-matter quasiparticles formed by photons strongly coupled to electron-hole pairs (excitons) in a halide perovskite semiconductor at room temperature. We experimentally map out both the real (energy) and imaginary (linewidth) parts of the spectrum near the exceptional points and extract the novel topological invariant—fractional spectral winding. Our work represents an essential step toward realization of non-Hermitian topological phases in a condensed matter system.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.language.isoenen_US
dc.relationMOE2018-T3-1-002en_US
dc.relationMOE2017-T2-1-001en_US
dc.relationMOE2018-T2-02-068en_US
dc.relationMOE2019-T2-1-004en_US
dc.relation.ispartofScience Advancesen_US
dc.rights© 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).en_US
dc.subjectScience::Physics::Optics and lighten_US
dc.titleDirect measurement of a non-Hermitian topological invariant in a hybrid light-matter systemen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.identifier.doi10.1126/sciadv.abj8905-
dc.description.versionPublished versionen_US
dc.identifier.pmid34731010-
dc.identifier.scopus2-s2.0-85118659253-
dc.identifier.issue45en_US
dc.identifier.volume7en_US
dc.identifier.spageeabj8905en_US
dc.subject.keywordsSuperfluidityen_US
dc.subject.keywordsExceptional Pointsen_US
dc.description.acknowledgementQ.X. acknowledges the National Natural Science Foundation of China (no. 12020101003), strong support from the State Key Laboratory of Low-Dimensional Quantum Physics, and start-up grant from Tsinghua University. T.C.H.L. acknowledges the support from Singapore Ministry of Education via AcRF Tier 3 Programme “Geometrical Quantum Materials” (MOE2018-T3-1-002) and AcRF Tier 2 grants (MOE2017-T2-1-001, MOE2018-T2-02-068, and MOE2019-T2-1-004). E.E., E.A.O., M.W., and M.P. acknowledge support from the Australian Research Council (ARC) through the Centre of Excellence Grant CE170100039. M.P. also acknowledges support from the Foundation for Polish Science in the START programme.en_US
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