He3-He4 dilution refrigerator for temperatures below 0.3 K down to <50 mK with optical access and installed magnet coil

• Subject Area: Condensed Matter Physics
• Term: Funded in 2019
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 427377618

We apply for a dilution refrigerator with optical access for performing experiments at a base temperature below 50 mK. In addition, it shall be possible to apply high magnetic or/and electric fields. The system will be used to address a broad spectrum of scientific projects that would benefit from the ultralow temperatures such as (a) high resolution spectroscopy of excitonic fine structure; (b) study of collective phases such as polariton- or exciton condensates, (c) dynamics of carrier and spin systems in extended nanostructures; (d) nuclear spin systems expected to show collective phases at extreme cooling and their influence on the carrier spin dynamics; (e) correlated materials with phase transitions in the mK-temperature range, in particular spin liquids; as well as (f) ultrafast acoustics in the regime of a few phonons or a single phonon.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: He3-He4 Mischkryostat für Temperaturen unter 0.3 K bis hinab zu <50 mK mit optischem Zugang und eingebauter Magnetspule
• Instrumentation Group: 8550 Spezielle Kryostaten (für tiefste Temperaturen)
• Applicant Institution: Technische Universität Dortmund
• Leader: Professor Dr. Manfred Bayer