Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Focus Session: Superconductivity in 2d-Materials and their Heterostructures
TT 10.7: Vortrag
Dienstag, 6. September 2022, 12:30–12:45, H3
Tuning lower dimensional superconductivity with hybridization at a superconducting-semiconducting interface — •M. Simonato1, A. Kamlapure1, E. Sierda1, M. Steinbrecher1, U. Kamber1, E. J. Knol1, P. Krogstrop2,3, M.I. Katsnelson1, A.A. Khajetoorians1, and M. Rösner1 — 1Radboud University, Institute for Molecules and Materials, Nijmegen, The Netherlands — 2Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark — 3Microsoft Quantum Materials Lab Copenhagen, Lyngby, Denmark
We demonstrate that the hybrid electronic structure derived at the interface between semiconducting black phosphorus and atomically thin films of lead can drastically modify the superconducting properties of the thin metallic film. Using ultra-low temperature scanning tunneling microscopy and spectroscopy, we observe a strongly anisotropic renormalization of the superconducting gap. To study the effect of hybridization, we develop a hybrid two-band model as an extension to conventional BCS theory in the Nambu-Gorkov formalism. In this model, we obtain analytical expressions for the effective gap and link the hybridization-driven renormalization to a weighting of the superconducting order parameter that quantitatively reproduces the measured spectra. These results illustrate the effect of interfacial hybridization at superconductor-semiconductor heterostructures, and pathways for engineering quantum technologies based on gate-tunable superconducting electronics.