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Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe2

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Marković,  Igor
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Biswas, D., Jones, A. J. H., Majchrzak, P., Choi, B. K., Lee, T.-H., Volckaert, K., et al. (2021). Ultrafast Triggering of Insulator-Metal Transition in Two-Dimensional VSe2. Nano Letters, 21(5), 1968-1975. doi:10.1021/acs.nanolett.0c04409.


Cite as: http://hdl.handle.net/21.11116/0000-0008-2B4E-2
Abstract
The transition-metal dichalcogenide VSe2 exhibits an increased charge density wave transition temperature and an emerging insulating phase when thinned to a single layer. Here, we investigate the interplay of electronic and lattice degrees of freedom that underpin these phases in single-layer VSe2 using ultrafast pump-probe photoemission spectroscopy. In the insulating state, we observe a light-induced closure of the energy gap, which we disentangle from the ensuing hot carrier dynamics by fitting a model spectral function to the time-dependent photoemission intensity. This procedure leads to an estimated time scale of 480 fs for the closure of the gap, which suggests that the phase transition in single-layer VSe2 is driven by electron-lattice interactions rather than by Mott-like electronic effects. The ultrafast optical switching of these interactions in SL VSe2 demonstrates the potential for controlling phase transitions in 2D materials with light. © 2021 American Chemical Society.