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O: Fachverband Oberflächenphysik
O 89: Spins on surfaces at the atomic scale II
O 89.3: Vortrag
Donnerstag, 12. März 2026, 15:30–15:45, WILL/A317
Spin Lifetime Engineering using Superconducting Surfaces — •Máté Stark, Luise Renz, Jonas Arnold, Johannes Schwenk, Christoph Sürgers, Wolfgang Wernsdorfer, and Philip Willke — Physikalisches Institut (PHI), Karlsruhe Institute of Technology, Karlsruhe, Germany
Extending the spin lifetime ( T1 ) and decoherence time ( T2 ) of atomic and molecular spins is central to realizing quantum-coherent spin systems on surfaces studied by scanning tunneling microscopy (STM). For instance, previous studies have demonstrated that T1 can be extended to nanoseconds for Fe-OEP-Cl on superconducting Pb(111) to milliseconds for Fe on MgO/Ag(001) by exploiting superconducting protection or electronic decoupling, respectively [1,2].
Building on these concepts, we aim here to combine protection by a superconducting gap and insulating decoupling layers to explore and control spin lifetimes of single FePc spins. By switching from the normal-conducting into the superconducting state we discuss how superconductivity as well as decoupling from the substrate and tip govern the lifetime and dynamics of molecular spin excitations. We show first results using all electric pump-probe spectroscopy, which are performed in a home-built dilution refrigerator scanning tunneling microscope operating at 50 mK.
[1] Nat. Phys. 9, 765 (2013)
[2] Nat. Phys. 13, 403 (2017)
Keywords: superconductor; spin relaxation; molecular spins