Freiburg 2024 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 2: Attosecond Physics I (joint session A/MO)

MO 2.5: Vortrag

Montag, 11. März 2024, 12:00–12:15, HS 1098

Designing a Topological Thin-Film X-Ray Cavity — •Hanns Zimmermann^1,2 and Adriana Pálffy¹ — ¹Julius-Maximilians-Universität Würzburg — ²Universität der Bundeswehr München

A promising platform for the quantum control of high-frequency photons are thin-film cavities, with one or several embedded layers of resonant nuclei such as ⁵⁷Fe with a Mössbauer transition at 14.4 keV. At grazing incidence, incoming x-rays couple evanescently to the cavity. In turn, the cavity field drives the nuclear transitions. The resulting nuclear response is well described by a recently-developed quantum optical model based on the electromagnetic Green’s function [1,2].

Here, we investigate theoretically a thin-film cavity design with multiple embedded ⁵⁷Fe layers, such that its inter-layer couplings are mostly restricted to the nearest neighbouring layers by intercalating additional layers with high electron densities. Via the geometrical properties of these domains and control of the evanescent field pattern, we implement alternating coupling strengths between the resonant layers. We show that this leads to an x-ray photonic realization of the non-hermitian Su-Schrieffer-Heeger model and investigate how for certain configurations localized nuclear excitations emerge at the edges of the cavity.

[1] X. Kong, et al. Phys. Rev. A 102, 033710 (2020)

[2] P. Andrejić and A. Pálffy, Phys. Rev. A 104, 033702 (2021)

Keywords: X-Ray Quantum Optics; Topological Quantum Optics; Su-Schrieffer-Heeger Model; Thin-Film Cavity