Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 55: Superconductivity: Tunnelling and Josephson Junctions
TT 55.6: Talk
Thursday, March 19, 2020, 11:00–11:15, HSZ 204
Photon-assisted resonant Andreev tunneling through Yu-Shiba-Rusinov states — •Olof Peters1, Nils Bogdanoff1, Sergio Acero Gonzalez2, Larissa Melischek2, Rika Simon1, Gaël Reecht1, Clemens B. Winkelmann3, Felix von Oppen2, and Katharina J. Franke1 — 1Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany — 3Univ. Grenoble Alpes, Institut Néel, 25 Avenue des Martyrs, 38042 Grenoble, France
The incoherent coupling of a photon field to the electrodes in a tunnel junction leads to photon-assisted tunneling expressed as symmetric sidebands. These bands can be very well described by the ac modulation of the energy levels in both electrodes [1].
We use scanning tunneling spectroscopy to investigate the Yu-Shiba-Rusinov (YSR) states of Mn adatoms inside the superconducting energy gap of Pb(111). At large tunneling resistance these YSR states show symmetric sidebands in an RF field of up to 40 GHz. At low resistance the tunneling process through the YSR state changes from single electron to resonant Andreev tunneling, which in contrast has asymmetric sidebands. By extending the theory of Tien and Gordon, we are able to explain and simulate this asymmetric splitting.
[1] P. K. Tien and J. P. Gordon, Phys. Rev. 129, 647 (1963)