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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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Vidas, L., Günther, C. M., Miller, T. A., Pfau, B., Perez-Salinas, D., Martínez, E., Schneider, M., Gührs, E., Gargiani, P., Valvidares, M., Marvel, R. E., Hallman, K. A., Haglund, R. F., Eisebitt, S. & Wall, S. (2021). Correction to "Imaging Nanometer Phase Coexistence at Defects During the Insulator-Metal Phase Transformation in VO2 Thin Films by Resonant Soft X-ray Holography". Nano Letters, 21(17), 7426-7426. https://doi.org/10.1021/acs.nanolett.1c03109
Mazzone, D. G., Meyers, D., Cao, Y., Vale, J. G., Dashwood, C. D., Shi, Y., James, A. J. A., Robinson, N. J., Lin, J., Thampy, V., Tanaka, Y., Johnson, A. S., Miao, H., Wang, R., Assefa, T. A., Kim, J., Casa, D., Mankowsky, R., Zhu, D. ... Dean, M. P. M. (2021). Laser-induced transient magnons in Sr3Ir2O7 throughout the Brillouin zone. Proceedings of the National Academy of Sciences (PNAS), 118(22), Article e2103696118. https://doi.org/10.1073/pnas.2103696118
Buades, B., Picón, A., Berger, E., León, I., Palo, N. D., Cousin, S. L., Cocchi, C., Pellegrin, E., Martin, J. H., Mañas-Valero, S., Coronado, E., Danz, T., Draxl, C., Uemoto, M., Yabana, K., Schultze, M., Wall, S., Zürch, M. & Biegert, J. (2021). Publisher's Note: Attosecond state-resolved carrier motion in quantum materials probed by soft x-ray XANES” [Appl. Phys Rev. 8, 011408 (2021)]. Applied Physics Reviews, 8(2), Article 029903. https://doi.org/10.1063/5.0054125
Johnson, A. S., Conesa, J. V., Vidas, L., Perez-Salinas, D., Günther, C. M., Pfau, B., Hallman, K. A., Haglund, R. F., Eisebitt, S. & Wall, S. (2021). Quantitative hyperspectral coherent diffractive imaging spectroscopy of a solid-state phase transition in vanadium dioxide. Science Advances, 7(33), Article eabf1386. https://doi.org/10.1126/sciadv.abf1386
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.