Regensburg 2022 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 5: New Methods and Developments: Scanning Probe Techniques 1 (joint session O/KFM)

KFM 5.8: Vortrag

Montag, 5. September 2022, 12:30–12:45, S053

Probing tunneling processes into YSR states with microwaves — •Janis Siebrecht¹, Haonan Huang¹, Piotr Kot¹, Sujoy Karan¹, Ciprian Padurariu², Björn Kubala², Joachim Ankerhold², Alfredo Levy Yeyati³, Juan Carlos Cuevas³, and Christian R. Ast¹ — ¹Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — ²Institut für Komplexe Quantensysteme and IQST, Universität Ulm, Ulm, Germany — ³Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, Madrid, Spain

Microwaves are an important tool in the manipulation of multi-level systems such as single spins on a surface, nitrogen vacancies in diamond or double quantum dots. Here we use a scanning tunneling microscope (STM) at a base temperature of 0.56 K to probe the intrinsic YSR states in a Vanadium tip in contact with a V(100) surface. The addition of an E-Band (60-90 GHz) microwave antenna at the junction opens the possibility to study the behavior of YSR states with AC driving- a scenario which has been subject to many theoretical but very few experimental studies. Using microwave-assisted tunneling, we gain insight into how the excited state participates in the tunneling process and how this is related to Andreev processes and parity conservation. Our results point at a new path, namely microwave manipulation of YSR states, which could be an important step towards using YSR states as qubits.