Experiments
 

The mK-STM is a home-built scanning tunneling microscope, which is attached to a dilution refrigerator by Janis operating at a base temperature of 10 mK. We have a 14 T out-of-plane and a 0.5 T in-plane magnetic field. The mK-STM is located in the precision lab for highest stability and a nearly noise-free environment. In single shot mode, we have reached temperatures as low as 7 mK. The main purpose of this instrument is to do spectroscopy at new quantum limits with highest energy resolution.

The µw-STM is a scanning tunneling microscope with a Joule-Thompson cryostat by CryoVac operating continuously at a base temperature of about 500 mK. We have also equipped this STM with a microwave generator and an antenna for supplying frequencies of up to 100 GHz to the tunnel junction. The main purpose of this instrument is to study the light-matter interaction in a tunnel junction.

The ESR-STM is commercial scanning tunneling microscope by Unisoku operating with He³ in single shot mode to reach a base temperature of 310 mK. The holding time at base temperature is up to 72 hours. We have equipped this STM with a microwave generator and an antenna at the tunnel junction so that we can supply frequencies up to 100 GHz to the tunnel junction. We also can apply an out-of-plane magnetic field of up to 6 T. The main purpose of this instrument is to combine electron spin resonance (ESR) spectroscopy with STM.