Aarhus University Seal

Simon Elliot Wall


Keywords

  • Condensed matter physics
  • Quantum and nanoscale materials
  • Structural dynamics
  • Light induced phase transitions
  • X-ray lasers
  • Synchrotron radiation
  • Symmetry

Head of the Ultrafast Dynamics of Quantum Materials group

Associate Professor

PhD in Physics

Optically controlling quantum materials.

Quantum materials exhibit fascinating and desirable properties, such as high temperature superconductivity, but are challenging to understand. They are complex systems in which multiple degrees of freedom compete to dictate the material’s properties These interactions both make it difficult to understand what drives the emergence of specific properties, but also opens new routes to control their properties.

Our research group exploits the entire electromagnetic spectrum, from THz radiation up to hard X-rays to manipulate and measure the properties of quantum materials. We are particularly interested in how lights can perturb and induce symmetry changes in quantum materials, and how these can be used to manipulate the properties of quantum materials. We do this with a range of lab-based ultrafast optical methods to track materials on timescale of a few femtoseconds and in addition, we exploit newly emerging X-ray lasers to capture atomic and nanoscopic changes in materials with light.

Recent publications

Sort by: Date | Author | Title

de la Pena Munoz, G. A., Correa, A. A., Yang, S., Delaire, O., Huang, Y., Johnson, A. S., Katayama, T., Krapivin, V., Pastor, E., Reis, D. A., Teitelbaum, S., Vidas, L., Wall, S. E. & Trigo, M. (2023). Ultrafast lattice disordering can be accelerated by electronic collisional forces. Nature Physics, 19(10), 1489-1494. https://doi.org/10.1038/s41567-023-02118-z
Johnson, A. S., Perez-Salinas, D., Siddiqui, K. M., Kim, S., Choi, S., Volckaert, K., Majchrzak, P. E., Ulstrup, S., Agarwal, N., Hallman, K., Haglund, R. F., Günther, C. M., Pfau, B., Eisebitt, S., Backes, D., Maccherozzi, F., Fitzpatrick, A., Dhesi, S. S., Gargiani, P. ... Wall, S. E. (2023). Ultrafast X-ray imaging of the light-induced phase transition in VO2. Nature Physics, 19(2), 215-220. https://doi.org/10.1038/s41567-022-01848-w
Bhattacharya, U., Chaudhary, S., Grass, T., Johnson, A. S., Wall, S. & Lewenstein, M. (2022). Fermionic Chern insulator from twisted light with linear polarization. Physical Review B, 105(8), Article L081406 . https://doi.org/10.1103/PhysRevB.105.L081406
Perez-Salinas, D., Johnson, A. S., Prabhakaran, D. & Wall, S. (2022). Multi-mode excitation drives disorder during the ultrafast melting of a C4-symmetry-broken phase. Nature Communications, 13, Article 238. https://doi.org/10.1038/s41467-021-27819-y
Pastor, E., Moreno-Mencía, D., Monti, M., Johnson, A. S., Fleischmann, N., Wang, C., Shi, Y., Liu, X., Mazzone, D. G., Dean, M. P. M. & Wall, S. (2022). Nonthermal breaking of magnetic order via photogenerated spin defects in the spin-orbit coupled insulator Sr3Ir2 O7. Physical Review B, 105(6), Article 064409. https://doi.org/10.1103/PhysRevB.105.064409