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A: Fachverband Atomphysik

A 12: Poster I

A 12.23: Poster

Dienstag, 7. März 2023, 16:30–19:00, Empore Lichthof

Non-Hermiticity and parity-time symmetry at x-ray wavelengths — •Fabian Richter and Adriana Pálffy — Julius- Maximilians-Universität Würzburg, Germany

A certain class of Hamiltonians which are non-Hermitian but obey parity-time (PT) symmetry exhibit real spectra thus mimicking Hermitian properties. This theoretical concept has recently found fertile ground in optics and photonics where non-Hermitian eigenstates can be created and superposed through optical gain and loss [1]. So far, these concepts have been mostly discussed in the optical regime. Similar control of x-rays is desirable due to their superior penetration power, high focusability and detection efficiency.

Here, we investigate theoretically non-Hermitian x-ray photonics based on PT symmetry in a thin-film cavity setup containing Mössbauer nuclei resonant to the x-ray radiation. These cavities present loss which is modelled by a Lindblad term in the master equation [2]. The presence of an external magnetic field introduces PT-symmetry breaking which could be used to control the properties of x-ray scattering.

[1] L. Feng et al., Nature Photon. 11, 752-762 (2017).

[2] X. Kong, D. Chang, A. Pálffy , Phys. Rev. A 102, 033710 (2020).