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.

*Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project-ID 258499086 – SFB 1170 and the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter – ct.qmat project-id 39085490 - EXC 2147.

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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