Direct measurement of a non-Hermitian topological invariant in a hybrid light-matter system
dc.contributor.author | Su, Rui | |
dc.contributor.author | Estrecho, Eliezer | |
dc.contributor.author | Bieganska, Dabrowka | |
dc.contributor.author | Huang, Yuqing | |
dc.contributor.author | Wurdack, Matthias | |
dc.contributor.author | Pieczarka, Maciej | |
dc.contributor.author | Truscott, Andrew | |
dc.contributor.author | Liew, T. C. H. | |
dc.contributor.author | Ostrovskaya, Elena | |
dc.contributor.author | Xiong, Qihua | |
dc.date.accessioned | 2023-07-13T23:22:27Z | |
dc.date.available | 2023-07-13T23:22:27Z | |
dc.date.issued | 2021 | |
dc.date.updated | 2022-05-08T08:16:51Z | |
dc.description.abstract | Topology 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_AU |
dc.description.sponsorship | Q.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_AU |
dc.format.mimetype | application/pdf | en_AU |
dc.identifier.issn | 2375-2548 | en_AU |
dc.identifier.uri | http://hdl.handle.net/1885/294219 | |
dc.language.iso | en_AU | en_AU |
dc.provenance | Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cite | en_AU |
dc.publisher | American Association for the Advancement of Science | en_AU |
dc.relation | http://purl.org/au-research/grants/arc/CE170100039 | en_AU |
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. | en_AU |
dc.rights.license | Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC) | en_AU |
dc.rights.uri | https://creativecommons.org/licenses/by-nc/4.0/ | en_AU |
dc.source | Science Advances | en_AU |
dc.title | Direct measurement of a non-Hermitian topological invariant in a hybrid light-matter system | en_AU |
dc.type | Journal article | en_AU |
dcterms.accessRights | Open Access | en_AU |
local.bibliographicCitation.issue | 45 | en_AU |
local.bibliographicCitation.lastpage | 9 | en_AU |
local.bibliographicCitation.startpage | 1 | en_AU |
local.contributor.affiliation | Su, Rui, Nanyang Technological University | en_AU |
local.contributor.affiliation | Estrecho, Eliezer, College of Science, ANU | en_AU |
local.contributor.affiliation | Bieganska, Dabrowka, College of Science, ANU | en_AU |
local.contributor.affiliation | Huang, Yuqing, Nanyang Technological University | en_AU |
local.contributor.affiliation | Wurdack, Matthias, College of Science, ANU | en_AU |
local.contributor.affiliation | Pieczarka, Maciej, College of Science, ANU | en_AU |
local.contributor.affiliation | Truscott, Andrew, College of Science, ANU | en_AU |
local.contributor.affiliation | Liew, T. C. H., Nanyang Technological University | en_AU |
local.contributor.affiliation | Ostrovskaya, Elena, College of Science, ANU | en_AU |
local.contributor.affiliation | Xiong, Qihua, Tsinghua University | en_AU |
local.contributor.authoremail | u5644644@anu.edu.au | en_AU |
local.contributor.authoruid | Estrecho, Eliezer, u5644644 | en_AU |
local.contributor.authoruid | Bieganska, Dabrowka, u1090947 | en_AU |
local.contributor.authoruid | Wurdack, Matthias, u1009240 | en_AU |
local.contributor.authoruid | Pieczarka, Maciej, u1041603 | en_AU |
local.contributor.authoruid | Truscott, Andrew, u4040705 | en_AU |
local.contributor.authoruid | Ostrovskaya, Elena, u9510052 | en_AU |
local.description.notes | Imported from ARIES | en_AU |
local.identifier.absfor | 510203 - Nonlinear optics and spectroscopy | en_AU |
local.identifier.absseo | 280120 - Expanding knowledge in the physical sciences | en_AU |
local.identifier.ariespublication | a383154xPUB22585 | en_AU |
local.identifier.citationvolume | 7 | en_AU |
local.identifier.doi | 10.1126/sciadv.abj8905 | en_AU |
local.identifier.scopusID | 2-s2.0-85118659253 | |
local.identifier.thomsonID | WOS:000715554500038 | |
local.identifier.uidSubmittedBy | a383154 | en_AU |
local.publisher.url | https://www.science.org/ | en_AU |
local.type.status | Published Version | en_AU |
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