Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 3: Focus Session: Spins on Surfaces studied by Atomic Scale Spectroscopies I
O 3.3: Vortrag
Montag, 18. März 2024, 11:15–11:30, MA 004
Dynamics of individual Yu-Shiba-Rusinov states measured with stochastic resonance spectroscopy — •Nicolaj Betz1, Vivek Krishnakumar Rajathilakam1, Susan Coppersmith2, Susanne Baumann1, and Sebastian Loth1 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2School of Physics, University of New South Wales, Sydney, Australia.
Coupling a spin to non-ohmic environments such as a superconductor can lead to new behavior with interesting dynamics. Thus far, the dynamics of emerging states like Yu-Shiba-Rusinov (YSR) states at individual atoms or molecules have mostly been investigated through tunneling rates [1,2]. Here, instead, we show a measurement that uses the synchronization of the state occupation with a frequency-dependent drive voltage to measure the dynamics of the tunneling through YSR states themselves. This technique relies on stochastic resonance which was previously used to measure spin dynamics [3]. We use a scanning tunneling microscope (STM) to measure the dynamics of YSR states of Fe atoms adsorbed on the oxygen-reconstructed surface of V(100) and find YSR state lifetimes in the picosecond range. This work provides a new level of insights into the dynamics of YSR states and can lead to a better understanding of relaxation mechanisms in spin-superconductor structures.
[1] M. Ruby et al., PRL 115, 087001 (2015).
[2] H. Huang et al., Nat. Phys. 16, 1227-1231 (2020).
[3] M. Hänze et al. Sci. Adv. 7, eabg2616 (2021).
Keywords: scanning tunneling microscopy; spin dynamics; superconductivity; Yu-Shiba-Rusinov states