High resolution spectroscopy apparatus for acousto-optic-electric investigations at low temperatures

• Subject Area: Condensed Matter Physics
• Term: Funded in 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 494822818

The requested apparatus enables high resolution acousto-opto-electric spectroscopy employing surface acoustic waves at low temperatures and high frequencies. The investigation of modern emerging classes of materials such as van der Waals heterostructures or nanoscale perovskites requires a versatile Systems. The apparatus comprises an optical cryostat, a supercontinuum white light laser and a vector network analyser. The configuration is completed by key components enabling time-resolved optical spectroscopy. The optical cryostat enables experiments over a wide range of temperature (below 5 K up to room temperature) and is equipped with radio frequency electrical connections and a 3-axis low temperature positioned. The supercontinuum white light laser is equipped with narrow bandpass tunable optical filters and enables optical excitation over a wide wavelength range from 410 nm up to 2000 nm. Surface acoustic waves are generated and detected by a 4-port vector network analyser. This unique configuration enables for instance the contact-free study of photoconductivity in nanoscale materials with highest spatial and spectral resolutions over a wide range of temperatures and at frequencies up to 20 GHz and to unravel the underlying physical mechanisms. The high frequencies up to 20 GHz accessible in the system enable the generation of novel acoustic lattices to trap and control charge and spin excitations. The apparatus is complemented with additional components required for time-integrated and time-resolved stroboscopic photoluminescence spectroscopy. Thus, the entire spectrum of advanced acousto-opto-electrical spectroscopy techniques are unified in the requested apparatus which enables the comprehensive investigation of a wide palette of modern hybrid Quantum and Nanomaterials with complementary methods.

• DFG Programme: Major Research Instrumentation
• Major Instrumentation: Hochauflösendes Spektroskopiesystem für akustooptoelektrische Untersuchungen bei tiefen Temperaturen
• Instrumentation Group: 5700 Festkörper-Laser
• Applicant Institution: Universität Münster
• Leader: Professor Dr. Hubert Johannes Krenner