Hi, I’m Geert, a PhD student working at the University of Amsterdam under the supervision of Edan Lerner.

My research focuses on amorphous solids and the glass transition. In particular, I study the statistical and mechanical properties of low-lying vibrational modes of model computer glasses, with the goal of understanding the role these excitations play in determining the dynamics and thermodynamics of glassy materials.

Some pictures (see publications)

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Visualizations of soft quasilocalized vibrational modes in (a) 2D, (b) 3D, and (c) a 3D projection of a 4D mode. (d) Symbols represent the spatial decay of the squared magnitude of the modes shown in panels (a)–(c), as a function of the distance \(r\) away from the modes’ respective cores. From: Phys. Rev. Lett. 121, 055501.
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Stress-strain curves for computer glasses made with \(k_{\lambda} = 10^4\), \(3 \times 10^3\), \(10^3\) and \(10^1\) [\(k_{\lambda}\) controls glass stability in our protocol], from (a) to (d). Stresses are rescaled by their respective average steady-state values. The large insets show representative snapshots of the deformed solids; the color coding represents the magnitude of total nonaffine displacements \(\delta x\) measured between \(\gamma = 0\) and \( \gamma = 0.13 \), rescaled by the length \( \rho^{−1/3} \). The small inset illustrates the geometry of the applied shear deformation. From: Phys. Rev. E 99, 012106.