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TT: Fachverband Tiefe Temperaturen
TT 51: Topological Superconductors
TT 51.4: Vortrag
Donnerstag, 20. März 2025, 17:30–17:45, H32
Proximity-Induced Superconductivity into Thin Films of Magnetic Topological Insulators — •Daniele Di Miceli1,2, Eduárd Zsurka1,3, and Thomas Schmidt1 — 1Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg, Luxembourg — 2Department of Physics, University of the Balearic Islands, E-07122 Palma, Spain — 3Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, D-52425 Jülich, Germany
Inducing superconducting (SC) correlations into magnetic topological insulators (MTIs) is becoming a promising route toward topological superconductivity and the realization of topologically protected Majorana bound states. However, a detailed understanding of the proximity effect in such MTI-SC heterostructures is still missing.
To address this question, we have developed a theory for the SC pairing induced by a conventional BCS superconductor on top of a 3D MTI thin film. By performing a perturbation series expansion in the electron tunneling between the SC and the MTI, we computed the corrections to the normal and anomalous Green's functions in the MTI in terms of the unperturbed propagators in the two isolated materials. Since the latter can be obtained exactly as a solution to the Gor'kov equations, this makes it possible to evaluate the Green's functions in the full MTI-SC heterostructures.
Our results provide a detailed description of the induced pairing, in particular showing the existence of p-wave correlations in the MTI.
Keywords: Magnetic topological insulators; Topological superconductors; Induced superconductivity; Perturbative theory