Gerard Verbiest

Open positions

Postdoc position:

Data-driven ultrasound actuation in optical nanoscopy

Master projects:

I have several master projects available. The list below gives a few examples of possible projects. If you are interested in a project on acoustics, dynamics, and/or 2D materials, please do not hesitate to contact me.

  • Atomic force microscopy (modeling dynamics, AI, ultrasound)
  • Ultrasound for microclimate monitoring in smart agriculture
  • Nonlinear response of graphene resonators as a function of strain
Education

Master courses:

  • Nonlinear dynamics (ME46072)
  • Physics for Mechanical Engineers (ME46005)
Publications
  1. R.J. Dolleman, G.J. Verbiest, Y.M. Blanter, H.S.J. van der Zant, and P.G. Steeneken, Physical review research 2, 012058(R) (2020), Nonequilibrium thermodynamics of acoustic phonons in suspended graphene. Link.

  2. R.J. Dolleman, Y.M. Blanter, H.S.J. van der Zant, P.G. Steeneken, and G.J. Verbiest, Physical review B 101, 115411 (2020), Phonon scattering at kinks in suspended graphene. Link.

  3. G.J. Verbiest, H. Jansen, D. Xu, X. Ge, M. Goldsche, J. Sonntag, T. Khodkov, L. Banszerus, N. von den Driesch, D. Buca, K. Watanabe, T. Taniguchi, and C. Stampfer, Review of Scientific Instruments 90, 084706 (2019), Integrated impedance bridge for absolute capacitance measurements at cryogenic temperatures and finite magnetic fields. Link.

  4. M. Goldsche, G.J. Verbiest, T. Khodkov, J. Sonntag, N. von den Driesch, D. Buca, and C. Stampfer, Nanotechnology 29, 37 (2018), Fabrication of comb-drive actuators for straining nanostructured suspended graphene. Link.

  5. G.J. Verbiest, J.N. Kirchhof, J. Sonntag, M. Goldsche, T. Khodkov, and C. Stampfer,Nano Letters 18, 8 (2018), Detecting Ultrasound Vibrations with Graphene Resonators. Link.

  6. M. Goldsche, J.Sonntag, T. Khodkov, G.J. Verbiest, S. Reichardt, C. Neumann, T. Ouaj, N. von den Driesch, D. Buca, and C. Stampfer, Nano Letters 18, 3 (2018), Tailoring mechanically-tunable strain fields in suspended graphene. Link.

  7. G.J. Verbiest, T.H. Oosterkamp, and M.J. Rost, Nanotechnology 28, 085704 (2017), Subsurface contrast due to friction in heterodyne force microscopy. Link.

  8. G. J. Verbiest, D. Xu, M. Goldsche, T. Khodkov, S. Barzanjeh, N. von den Driesch, D. Buca, and C. Stampfer, Phys. Appl. Phys. Lett. 109, 143507 (2016), Tunable mechanical coupling between driven microelectromechanical resonators. Link.

  9. G.J. Verbiest and M.J. Rost, Ultramicroscopy 171, 70 (2016), Resonance Frequencies of AFM cantilevers in Contact with a Surface. Link.

  10. G.J. Verbiest, M. Andersen, S. Huber, C. Stampfer, and K. Reuter, Phys. Rev. B 93, 195438 (2016), Interplay between nanometer-scale strain variations and externally applied strain in graphene. Link.

  11. G.J. Verbiest, S. Brinker, and C. Stampfer, Phys. Rev. B 92, 075417 (2015), Uniformity of the pseudomagnetic field in strained graphene. Link.

  12. G.J. Verbiest, D.J. van der Zalm, T.H. Oosterkamp, and M.J. Rost, Rev. Sci. Instr. 86, 033704 (2015), A Subsurface Add-On for standard Atomic Force Microscopes. Link.

  13. G.J. Verbiest and M.J. Rost, Nat. Commun. 6, 6444 (2015), Beating beats Mixing in Heterodyne Detection Schemes. Link.

  14. G.J. Verbiest, T.H. Oosterkamp, and M.J. Rost, Nanotechnology 24, 365701 (2013), Subsurface-AFM: Sensitivity to the Heterodyne Signal. Link.

  15. G.J. Verbiest, T.H. Oosterkamp, and M.J. Rost, Ultramicroscopy 135, 113 (2013), Cantilever Dynamics in Heterodyne Force Microscopy. Link.

  16. G.J. Verbiest, J.N. Simon, T.H. Oosterkamp, and M.J. Rost, Nanotechnology 23, 145704 (2012) Subsurface atomic force microscopy: towards a quantitative understanding. Link.

  17. G.J. Verbiest and A. Achúcarro, Phys. Rev. D. 84, 105036 (2011) High speed collision and reconnection of Abelian Higgs strings in the deep type-II regime. Link.

  18. A. Achúcarro and G.J. Verbiest, Phys. Rev. Lett. 105, 021601 (2010) Higher Order Intercommutations in Cosmic String Collisions. Link.

Assistant Professor

Gerard Verbiest joined the DMN research group as of 1 August 2018.

Acoustic sensing and actuation is widely used in daily life applications. Yet, its application at the nanoscale has remained a major challenge. This has motivated Gerard to conduct research on nanoscale acoustics in atomic force microscopes for imaging purposes and graphene-based electromechanical systems for sensing purposes as well as for fundamental properties of two-dimensional materials. Gerard studies the propagation of sound waves at the nanoscale through nano-devices in order to understand the wave front arriving at the surface of the device and detects these with an atomic force microscope. Gerard was the first to quantitatively determine the physical contrast mechanism in such measurements, which requires detailed understanding of the nonlinear tip-sample interaction, the resonance frequencies of the cantilever, and the indirect ultrasound pick up. The key objective was to resolve the inner structure from the device in a similar way to conventional ultrasound imaging. Later on, Gerard studied the response of graphene to bulk acoustic waves and strain, as graphene has excellent mechanical properties for the application in acoustic sensors and actuators. Gerard was the first to show that graphene resonators can detect acoustic waves traveling through the substrate. In the future, Gerard plans to use his knowledge on these topics to develop new acoustic imaging techniques at the nanoscale as well as acoustic sensing techniques employing nanoscale two-dimensional materials at various length scales. Currently, Gerard is involved in the Plantenna project, a 4TU initiative, to study the application of ultrasound in agriculture and to develop autonomous sensor networks.

Gerard holds a bachelor degree in Physics, a master in theoretical physics (cum laude), and a PhD in experimental physics from Leiden University. He worked as postdoctoral researcher at the RWTH in Aachen, Germany. His work has been featured in, among others, Nature Communications, Physical Review Letters, and Nano Letters.