SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Focus Session: New Perspectives for Adiabatic Demagnetization Refrigeration in the Kelvin and sub-Kelvin Range (joint session TT/MA)

TT 19.3: Hauptvortrag

Dienstag, 28. März 2023, 10:30–11:00, HSZ 03

A millikelvin scanning tunnelling microscope in ultra-high vacuum with adiabatic demagnetisation refrigeration — •Ruslan Temirov — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, Germany — University of Cologne, Institute of Physics II, Cologne, Germany

Scanning tunnelling microscopes (STMs) operating in ultra-high vacuum (UHV) and low-temperature conditions are used widely for imaging and precise manipulation of surface nanostructures. A growing interest in studies of quantum-coherent phenomena in such nanostructures stimulates the development of STMs that operate at very low millikelvin temperatures. This contribution presents the design of a first-ever UHV STM cooled by adiabatic demagnetisation refrigeration (ADR) to below 30 mK. The use of ADR makes the STM design modular and helps it to reach a remarkable degree of mechanical stability. Tunnelling spectra collected on an atomically clean superconducting Al(100) surface reveal that the electronic temperature of the tunnelling junction is less than 80 mK. The inelastic electron tunnelling spectroscopy of an individual electron spin performed in magnetic fields of up to 8 Tesla validates the STM capabilities for quantum nanoscience research.