SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Electronic Structure of Surfaces I
O 59.9: Talk
Wednesday, March 29, 2023, 17:15–17:30, REC C 213
The Meservey-Tedrow-Fulde vortex in epitaxial aluminum near the monolayer limit — •Werner M.J. van Weerdenburg1, Anand Kamlapure1, Eirik Fyhn Holm2, Niels P.E. van Mullekom1, Xiaochun Huang1, Manuel Steinbrecher1, Peter Krogstrup3, Jacob Linder2, and Alexander A. Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University Nijmegen, the Netherlands — 2Center for Quantum Spintronics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway — 3NNF Quantum Computing Programme, Niels Bohr Institute, University of Copenhagen, Denmark
The critical magnetic field of 2D superconductors is greatly enhanced for fields parallel to the 2D plane. In the case of aluminum, this gives rise to a spin-splitting of the coherence peaks, referred to as the Meservey-Tedrow-Fulde (MTF) effect. In the MTF regime, it has been proposed that unconventional odd-frequency (ωo) spin-triplet pairing is promoted [1], but their presence is experimentally hard to detect.
Here, we study vortices in thin epitaxial Al films on Si(111) in the MTF regime by applying a vector magnetic field with a large in-plane component, and find experimental evidence of odd-frequency pairing [2]. Strikingly, we find that the shape of the vortex structure is strongly modified and exhibits a gapless region. Numerical simulations confirm a connection between this vortex shape and the presence of ωo pairing, highlighted by a paramagnetic Meissner effect.
[1] J. Linder & J. Robinson, Scientific Reports 5, 15483 (2015)
[2] W. van Weerdenburg et al., arXiv:2210.10645 (2022)