Dry pulse-tube based dilution refrigerators
Two dry pulse-tube based dilution refrigerators: One BlueFors BF-LD250 cryostats, one BF-SD250. Cryostats are configured so that they can be employed from simple DC electrical measurements to involved microwave measurements for noise, cross-correlations, and vibrations in NEMS resonators. One cryostat is equipped with 9T superconducting magnet. Specifications: - Base temperature: 8-10 mK, - Cooling power mixing chamber @ 100 mK: 250 uW, - Cool-down time to base temperature SD: 18 hrs, - Cool-down time to base temperature LD 24 hrs, - Mixing chamber diameter: SD Series 150mm LD Series 290mm.
Dry nuclear demagnetization cryostat
Based on BlueFors model BF-LD400 dilution refrigerator with 9T superconducting magnet. Characteristics of dilution unit: - Base temperature: 7 mK, - Cooling power mixing chamber @ 100 mK: 550 μW. The experimental cell for liquid 3He (0.6 mol) is embedded inside the top part of the nuclear demagnetization stage. The refrigerator cools 3He in the experimental cell down to 160 μK.
Plastic Dilution Refrigerator (PDR)
One small 3He/4He dilution refrigerator down to 30-50 mK with approximately 4-hour cool down time. These plastic dilution refrigerators, which are built in-house, provide us with fast cool down times and thus high throughput in sample characterization.
Room temperature measurement and characterization equipment
A wide range of equipment for sample characterisation, including Micro-Raman, scanning electron microscope, atomic force microscope, RF testing equipment, etc.
Nano- and Micro-fabrication facilities
The following facilities are available in the Low Temperature Labs semi-clean room: electron beam lithography, field emission electron microscope JEOL7100F, DCA UHV e-beam evaporator system with sample stage having angle control and rotation, film deposition system, reactive ion etching, critical point dryer, etc.