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Reentrant Defect Modes in a PT-Symmetric Circuit

ORAL

Abstract

Systems obeying PT-symmetry are a special case in non-Hermitian physics where real eigenvalue spectra can still emerge. They usually exhibit a phase diagram with different regimes of symmetry conservation or spontaneous symmetry breaking in their eigenstates. We examine a localized zero-energy defect mode within a PT-symmetric hopping model that disappears and re-emerges at different PT phase transitions and present an exhaustive explanation for this phenomenon. Our theoretical findings are confirmed by eigenstate measurements for different gain/loss profiles in an electrical circuit implementation.

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Presenters

  • Alexander Stegmaier

    Theoretical physics I, University of Wuerzburg

Authors

  • Alexander Stegmaier

    Theoretical physics I, University of Wuerzburg

  • Tobias Helbig

    Theoretical physics I, University of Wuerzburg, Institute for Theoretical Physics and Astrophysics, University of Wurzburg, University of Wurzburg

  • Tobias Hofmann

    Theoretical physics I, University of Wuerzburg, Institute for Theoretical Physics and Astrophysics, University of Wurzburg, University of Wurzburg

  • Ronny Thomale

    University of Wurzburg, Institute for Theoretical Physics, University of Wuerzburg, Theoretical physics I, University of Wuerzburg, University of Wuerzburg, Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Physics department, University of Wuerzburg, Institut für Theoretische Physik und Astrophysik, University of Würzburg, Institute for Theoretical Physics and Astrophysics, University of Wurzburg