Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.48: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Construction of mK-scanning tunneling microscope combined with electron spin resonance technique — •Won-Jun Jang1,2, Jinkyung Kim1,2, Thi Hong Hong1,2, Denis Krylov1,2, and Andreas Heinrich1,21Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul 03760, Republic of Korea — 2Ewha Womans University, Seoul 03760, Republic of Korea

For a well-defined energy resolution of STM combined with electron spin resonance (ESR) technique, the lowering the effective temperature is necessary. Here we present technical efforts for the construction of mK-STM with the lowest effective temperature under ESR measurement. To reduce the effective temperature, we need to be lower a base temperature of inner conductor of RF signal lines, RF noises and the eddy current effect by external vibration. We achieved 10 mK using the dilution refrigerator (Janis research) with STM supporting structures made by SiPCu. We applied the thermal anchoring structure for RF signal lines. To reduce RF noises, we are planning to use RF filter at each signal line. To prevent the external vibration, we designed the pendulum structure for the circulation line for mixture gas and two vibration isolation stages. And also, we applied the slit structure to reduce the eddy current. Finally, we will introduce our effective temperature by the measurement of superconducting gap.

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