Research overview
© AG Schlenhoff

Our research group Atomic‑scale Microscopy & Spectroscopy, founded at the University of Münster at the end of 2022, focuses on the atomic‑scale investigation of correlations among structural, electronic, magnetic, and optical properties of low‑dimensional (magnetic) solid‑state systems. In addition, we aim to advance the methodological capabilities required for these investigations.

As illustrated above, our scientific interest spans the local characterization of atomic and molecular spin centers, the spatially resolved study of non‑collinear and topological spin textures in thin films and magnetic moiré structures, and the associated interfacial effects in two‑dimensional hetero‑ and hybrid structures. A further research focus is the atomic‑scale examination of spin transport, spin dynamics, and spin manipulation, together with the related charge‑spin conversion efficiency.

We have strong expertise in, and actively develop, our own innovative in‑house techniques based on spin‑polarized scanning tunneling microscopy (SP‑STM) and spin‑polarized scanning tunneling spectroscopy (SP‑STS), which are employed to investigate all of the aforementioned phenomena. The current portfolio is being expanded to include light‑assisted (SP‑)STM/STS methods, enabling the exploration of optically induced opto-electronic and magneto‑optical phenomena at the atomic scale by photo‑excitation of the (magnetic) tunneling junction.


Instrumentation

  • © AG Schlenhoff

    Instrumentation

    Our laboratory is equipped with a combined Low-Temperature Scanning Tunneling Microscope/Atomic Force Microscope (LT-STM/AFM) operating at liquid Helium (<5K) and liquid Nitrogen (<78K) temperatures and under ultra-high vacuum (UHV) conditions. The guidance of light into and out of the tip-sample junction is realized via two dedicated optical accesses to the microscope in combination with in-situ lenses attached close to the probe tip-sample junction. An additional optical access to the junction allows single-atom deposition onto the cold sample within the microscope. We have standard in-situ tip and sample preparation techniques that we continuously expand to our needs. We are equipped with an Acton Pro Spectrometer with a cooled CCD camera for analyzing the light emission from the junction and with different laser sources for light excitation of the junction.

    As a growing group we are developing novel instrumental setups tailored for our research objectives.

  • © AG Schlenhoff

    Lab Infrastructure

    Our renovated and modernized laboratory rooms in the basement of IG1 provide optimum conditions for our (SP-)STM/STS experiments, also in combination with our future optical setup.

    They feature low-noise high-precision air conditioning, sound-insulated doors, suspended ceilings, and sound-absorbing wall elements to reduce sound propagation. In addition, our laboratories provide pits with mechanically decoupled concrete foundations to place our STMs on it. Additional technical rooms for air conditioning units and noisy pumps, as well as measurement and control rooms directly adjacent to the STM laboratories complete our lab infrastructure.

Methods

  • © AG Schlenhoff

    Scanning Tunneling Microscopy (STM)

    Detailed explanation will come soon...

  • © AG Schlenhoff

    Scanning Tunneling Spectroscopy (STS)

    Detailed explanation will come soon...

  • © AG Schlenhoff

    Resonant Tunneling

    IPS as local quantum sensor

    Detailed explanation will come soon...

    © AG Schlenhoff

    Resonant Tunneling

    Detailed explanation will come soon...

  • © AG Schlenhoff

    Spin-polarized Scanning Tunneling Microscopy (SP-STM)

    Detailed explanation will come soon...

  • © AG Schlenhoff

    Light-assisted STM/STS

    Detailed explanation will come soon...

  • In-situ Molecular Beam Epitaxy (MBE)

     

Topics

  • Coming soon...