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Annihilation of exceptional points from different Dirac valleys in a 2D photonic system

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  • M. Król

    (Institute of Experimental Physics, Faculty of Physics, University of Warsaw)

  • I. Septembre

    (Institut Pascal, PHOTON-N2, Université Clermont Auvergne, CNRS, Clermont INP)

  • P. Oliwa

    (Institute of Experimental Physics, Faculty of Physics, University of Warsaw)

  • M. Kędziora

    (Institute of Experimental Physics, Faculty of Physics, University of Warsaw)

  • K. Łempicka-Mirek

    (Institute of Experimental Physics, Faculty of Physics, University of Warsaw)

  • M. Muszyński

    (Institute of Experimental Physics, Faculty of Physics, University of Warsaw)

  • R. Mazur

    (Institute of Applied Physics, Military University of Technology)

  • P. Morawiak

    (Institute of Applied Physics, Military University of Technology)

  • W. Piecek

    (Institute of Applied Physics, Military University of Technology)

  • P. Kula

    (Institute of Chemistry, Military University of Technology)

  • W. Bardyszewski

    (Institute of Theoretical Physics, Faculty of Physics, University of Warsaw)

  • P. G. Lagoudakis

    (Skolkovo Institute of Science and Technology
    University of Southampton)

  • D. D. Solnyshkov

    (Institut Pascal, PHOTON-N2, Université Clermont Auvergne, CNRS, Clermont INP
    Institut Universitaire de France (IUF))

  • G. Malpuech

    (Institut Pascal, PHOTON-N2, Université Clermont Auvergne, CNRS, Clermont INP)

  • B. Piętka

    (Institute of Experimental Physics, Faculty of Physics, University of Warsaw)

  • J. Szczytko

    (Institute of Experimental Physics, Faculty of Physics, University of Warsaw)

Abstract

Topological physics relies on Hamiltonian’s eigenstate singularities carrying topological charges, such as Dirac points, and – in non-Hermitian systems – exceptional points (EPs), lines or surfaces. So far, the reported non-Hermitian topological transitions were related to the creation of a pair of EPs connected by a Fermi arc out of a single Dirac point by increasing non-Hermiticity. Such EPs can annihilate by reducing non-Hermiticity. Here, we demonstrate experimentally that an increase of non-Hermiticity can lead to the annihilation of EPs issued from different Dirac points (valleys). The studied platform is a liquid crystal microcavity with voltage-controlled birefringence and TE-TM photonic spin-orbit-coupling. Non-Hermiticity is provided by polarization-dependent losses. By increasing the non-Hermiticity degree, we control the position of the EPs. After the intervalley annihilation, the system becomes free of any band singularity. Our results open the field of non-Hermitian valley-physics and illustrate connections between Hermitian topology and non-Hermitian phase transitions.

Suggested Citation

  • M. Król & I. Septembre & P. Oliwa & M. Kędziora & K. Łempicka-Mirek & M. Muszyński & R. Mazur & P. Morawiak & W. Piecek & P. Kula & W. Bardyszewski & P. G. Lagoudakis & D. D. Solnyshkov & G. Malpuech , 2022. "Annihilation of exceptional points from different Dirac valleys in a 2D photonic system," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-33001-9
    DOI: 10.1038/s41467-022-33001-9
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