Low temperature SPM
Our lab houses a commercial UHV-LT- NC-AFM/STM (Createc). In the MoMaLab we connect this instrument with a virtual reality human interface consisting of a motion capture system (VICON) and a fully immersive head-mounted 3D display (Oculus Rift DK2). This allows controlling of the SPM tip position in 3D simply by hand motion. The display shows the live trajectory and measurement data but can also show previously recorded data for reference. The virtual reality interface is also connected to our real-time simulation of the manipulation process such that an intuitive interaction is possible. Thereby we can gain real intuition for the mechanics at the nanometer scale.
Motion capture systemOne of the paramount goals in nanotechnology is molecular-scale functional design, which includes arranging molecules into complex structures at will. The first steps towards this goal were made through the invention of the scanning probe microscope (SPM), which put single-atom and single-molecule manipulation into practice for the first time. Extending the controlled manipulation to larger molecules is expected to multiply the potential of engineered nanostructures. We enhance the SPM technique that makes the manipulation of large molecular adsorbates much more effective. By using a commercial motion tracking system, we couple the movements of an operator's hand to the sub-angstrom precise positioning of an SPM tip. Literally moving the tip by hand we write a nanoscale structure in a monolayer of large molecules, thereby showing that our method allows for the successful execution of complex manipulation protocols even when the potential energy surface that governs the interaction behaviour of the manipulated nanoscale object(s) is largely unknown.
 Moving Molecules by Hand, Beilstein TV Video Feature (2015)  M. F. B. Green et al. Patterning a hydrogen-bonded molecular monolayer with a hand-controlled SPM, Beilstein J. Nanotechnol. (2014)
Oculus rift VR displayBy adding Oculus Rift virtual reality goggles to our hand-controlled manipulation setup we provide the experimentalist with 3D visual feedback that displays the currently executed tip trajectory and the position of the SPM tip during manipulation in real time, while simultaneously plotting the experimentally measured frequency shift (Δf) of the non-contact atomic force microscope (NC-AFM) tuning fork sensor as well as the magnitude of the electric current (I) flowing between the tip and the surface. Furthermore, one has the option to load and display previously recorded trajectories for reference.  P. Leinen et al. Virtual reality visual feedback for hand-controlled scanning probe microscopy manipulation of single molecules, Beilstein J. Nanotechnol. (2015)
▶June 10th, 2019New scanning quantum dot microscopy (SQDM) paper online. Quantitative measurements of surface potentials and dipoles. New window to the nanoscale world. Read at Nature Materials Read full-text w/o subscription
▶February 15th, 2019We welcome Joshua Scheidt, computer science student at Maastricht University, who joins the MoMaLab to do his master thesis.
▶February 4th, 2019Hand-controlled STM-based atomic manipulation with real-time visual feedback from an MD simulation Read at Beilstein..
▶October 25th, 2018We have been granted 2 Mio core‑h on JURECA for our simulation work on molecular adsorption and manipulation.
▶ Hands-on DFT and beyondBarcelona, Spain, August 26 - September 6, 2019
▶ 704. WE-Heraeus-Seminar "Exploring the Limits of Nanoscience with Scanning Probe Methods"Bad Honnef, Germany, 27-31 October 2019