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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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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
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. (2018). Imaging Nanometer Phase Coexistence at Defects during the Insulator-Metal Phase Transformation in VO2 Thin Films by Resonant Soft X-ray Holography. Nano Letters, 18(6), 3449-3453. https://doi.org/10.1021/acs.nanolett.8b00458
Vidas, L., Schick, D., Martinez, E., Perez-Salinas, D., Ramos-Alvarez, A., Cichy, S., Batlle-Porro, S., Johnson, A. S., Hallman, K. A., Haglund, R. F. & Wall, S. (2020). Does VO2 Host a Transient Monoclinic Metallic Phase? Physical Review X, 10(3), Article 031047. https://doi.org/10.1103/PhysRevX.10.031047
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
Teo, T. Y., Ma, X., Pastor, E., Wang, H., George, J. K., Yang, J. K. W., Wall, S., Miscuglio, M., Simpson, R. E. & Sorger, V. J. (2022). Programmable chalcogenide-based all-optical deep neural networks. Nanophotonics, 11(17), 4073-4088. https://doi.org/10.1515/nanoph-2022-0099