3He-4He-Entmischungskryostat (cryo-free)

• Subject Area: Condensed Matter Physics
• Term: Funded in 2011
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 211485428

We wish to develop studies on proximity induced superconductivity, quantum hall effect, noise, high-frequency properties (including nanomechanical resonators) for fast electronics and sensors, spin transport molecular junctions, molecular transistors and topological insulators. In order to probe the most fundamental electronic properties of nanostructure, the lowest temperatures are needed. A Cryo-free dilution refrigerator is a powerful and versatile system that allows reaching very low temperature (20 mK) without the need of any cryogenics. No expensive helium is needed to run such apparatus. No additional personal cost is needed to run or maintain the system. Given its large sample space, home made customization for various research purposes is possible. It is particularly important for high frequency experiments which require additional large electronic devices close to the measured sample. Nowadays, cooling down the system with a powerful magnet is possible. Cryo-free dilution refrigerator works with pulse tubes that are mechanically decoupled from the sample flange avoiding vibrations. This system allows full automation of experiments from room temperature down to base temperature, without any extra-maintenance of the device. It will allow us to probe the fundamental properties of nanostructures like graphene and other molecular systems.

• DFG Programme: Major Research Instrumentation
• Instrumentation Group: 8550 Spezielle Kryostaten (für tiefste Temperaturen)
• Applicant Institution: Karlsruher Institut für Technologie
• Leader: Dr. Romain Danneau