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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

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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
Moreno-Mencía, D., Ramos-Álvarez, A., Vidas, L., Koohpayeh, S. M. & Wall, S. (2019). Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material. Nature Communications, 10(1), Article 4034. https://doi.org/10.1038/s41467-019-11743-3
Cao, Y., Mazzone, D. G., Meyers, D., Hill, J. P., Liu, X., Wall, S. & Dean, M. P. M. (2019). Ultrafast dynamics of spin and orbital correlations in quantum materials: An energy and momentum-resolved perspective. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 377(2145), Article 20170480. https://doi.org/10.1098/rsta.2017.0480
Wall, S., Yang, S., Vidas, L., Chollet, M., Glownia, J. M., Kozina, M., Katayama, T., Henighan, T., Jiang, M., Miller, T. A., Reis, D. A., Boatner, L. A., Delaire, O. & Trigo, M. (2018). Ultrafast disordering of vanadium dimers in photoexcited VO2. Science, 362(6414), 572-576. https://doi.org/10.1126/science.aau3873
Johnson, A. S., Salinas, D. P., Siddiqui, K. M., Volckaert, K., Majchrzak, P. E., Kim, S., Choi, S., Günther, C. M., Hallman, K. A., Haglund, R. F., Valvidares, M., Ulstrup, S., Park, S. H., Kim, H. & Wall, S. (2021). Time-resolved X-ray holographic imaging of the light-induced phase transition in vanadium dioxide. Paper presented at 2021 European Conference on Lasers and Electro-Optics, CLEO/Europe 2021, Virtual, Online, Germany.