Regensburg 2022 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 12: Focus Session: Nonlinear Dynamics of Nanomechanic Oscillators
DY 12.6: Hauptvortrag
Montag, 5. September 2022, 17:15–17:45, H20
2D membranes in motion — •Herre van der Zant — Kavli Institute of Nanoscience, Department of Quantum Nanoscience, Delft University of Technology, The Netherlands
Atomically thin membranes are ideal building blocks for nanoelectromechanical systems (NEMS) because of their unique mechanical properties and their low mass. We make membranes by transferring atomically thin layers on top of silicon oxide substrates that are pre-patterned with circular or rectangular holes. The suspended membranes are characterized by a laser interferometer set-up that gives access to information on the dynamics in the frequency- and time-domain. The setup is equipped with a moveable x-y stage so that the membrane motion can be visualized; the nonlinear response of the motion is used to extract the mechanical parameters including the Young’s modulus. Recently, it has become clear that nanomechanics can also probe thermodynamic properties such as thermal conductivity, specific heat, and thermal expansion [Dynamics of 2D material membranes, 2D Materials 8 (2021) 042001]. Specifically, phase transitions are typically accompanied by abrupt changes in the specific heat, resulting in accompanying changes in the strain of the material which are measured via mechanical resonances. In this way, we have detected the Néel temperature of antiferromagnetic FePS3 membranes, their magnetic anisotropy and studied the nonlinear coupling between magnetic and elastic properties.