Rotter, S. (2023, August 16). Non-Hermitian Topology in Lasers and Anti-Lasers [Conference Presentation]. Non-Hermitian Topology: from Classical Optics to Quantum Matter, Dresden, Germany.
Non-Hermitian Topology: from Classical Optics to Quantum Matter
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Event date:
14-Aug-2023 - 18-Aug-2023
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Event place:
Dresden, Germany
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Keywords:
Non-Hermitian Physics; Topology
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Abstract:
n my presentation, I will first speak about the topological aspects of encircling an exceptional point (EP) in a laser and the corresponding chiral state transfer [1]. Building on the insight that EPs can also be identified in the absorption spectra of anti-lasers [2], I will present experimental results on the chiral and degenerate perfect absorption at an EP [3]. Finally, I will show how not only two modes can be critically coupled, but more than a thousand – leading to a massively degenerate coherent perfect absorber for arbitrary incoming wavefronts [4].
[1] A. Schumer, Y. G. N. Liu, J. Leshin, L. Ding, Y. Alahmadi, A. U. Hassan, H. Nasari, S. Rotter, D. N. Christodoulides, P. LiKamWa, and M. Khajavikhan, Science 375, 884 (2022)
[2] W. R. Sweeney, C. W. Hsu, S. Rotter, and A. D. Stone, Phys. Rev. Lett. 122, 093901 (2019)
[3] S. Soleymani, Q. Zhong, M. Mokim, S. Rotter, R. El-Ganainy, and S. K. Özdemir, Nature Commun. 13, 599 (2022)
[4] Y. Slobodkin, G. Weinberg, H. Hörner, K. Pichler, S. Rotter, and O. Katz, Science 377, 995 (2022)
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Research facilities:
Vienna Scientific Cluster
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Project title:
Wellenkontrolle in Systemen mit Absorption und Unordnung: P 32300-N27 (FWF Fonds zur Förderung der wissenschaftlichen Forschung (FWF))
