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TT: Fachverband Tiefe Temperaturen

TT 10: Topology: Majorana Physics I

TT 10.7: Vortrag

Montag, 18. März 2024, 16:45–17:00, H 2053

Hybrid light-matter states in topological superconductors coupled to cavity photons — •Olesia Dmytruk¹ and Marco Schirò² — ¹CPHT, CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France — ²JEIP, UAR 3573 CNRS, Collège de France, PSL Research University, 11 Place Marcelin Berthelot, 75321 Paris Cedex 05, France

Using photonic cavities to probe and to control properties of the materials is a novel research direction of condensed matter physics. Topological materials play particularly important role in this direction due to their robustness and their possible application in quantum technologies. We study a topological superconductor that hosts Majorana bound states strongly coupled to cavity photons. We consider two models for topological behaviour: a prototype Kitaev chain and experimentally relevant semiconducting-superconducting nanowire. We find that the cavity photonic spectral function directly related to polariton spectrum of the hybrid system depends on the parity of the Majorana bound states in the topological phase. Moreover, we demonstrate that the peaks in cavity spectral function appear at different energy scales for the electronic chain in the trivial and topological phases. Therefore, cavity spectral function could be used to probe Majorana bound states in topological superconductors.

[1] O. Dmytruk, M. Schirò, arXiv:2310.01296

Keywords: Majorana bound states; Topological superconductors; Light-matter interaction; Photonic cavities; Polaritons