Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 56: Superconductivity: Theory I
TT 56.4: Vortrag
Mittwoch, 11. März 2026, 15:45–16:00, CHE/0089
Generalized condition for odd-frequency pairing in multiband materials — •Florian Kayatz1,2, Annica M. Black-Schaffer1, and Jorge Cayao1 — 1Department of Physics and Astronomy, Uppsala University, Box 516, SE-752 37 Uppsala, Sweden — 2WISE - allenberg Initiative Materials Science for Sustainability, Department of Physics and Astronomy, Uppsala University, Sweden
Odd-frequency superconductivity has been predicted to arise in various physical systems, including multiband materials, and is known to lead to phenomena such as the unusual Meissner response and long-range proximity effect [1]. The emergence of odd-frequency superconductivity is often explained in terms of a condition derived up to first order in the superconducting order parameter [2], leaving higher order corrections unaccounted. Here, we extend this analysis and derive the odd-frequency condition involving higher-order contributions of the order parameter, as well as a generalized expression valid to all orders. In addition, we explore the conditions for the emergence of odd-frequency correlations between individual bands. This allows us to identify cases where the structure of the Hamiltonian inherently forbids odd-frequency pairing. As an example, we apply our condition to a weakly coupled system consisting of a transition metal dichalcogenide monolayer proximitzed by a conventional spin-singlet s-wave superconductor.
[1] J. Linder and A. V. Balatsky, Rev. Mod. Phys. 91, 045005 (2019)
[2] C.Triola,J.Cayao,A.M.Black-SchafferAnn.Phys.532,1900298(2020)
Keywords: Odd-frequency; Multiband materials; Superconductivity; Proximity effect