1. Light-induced renormalization of the band structure of chiral tellurium
- Author
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Gatti, G., Tancogne-Dejean, N., Hübener, H., De Giovannini, U., Dai, J., Polishchuk, S., Bugnon, Ph., Frassetto, F., Poletto, L., Chergui, M., Grioni, M., Rubio, A., Puppin, M., and Crepaldi, A.
- Subjects
Condensed Matter - Materials Science ,Condensed Matter - Strongly Correlated Electrons - Abstract
Chirality in tellurium derives from a Peierls distortion driven by strong electron-phonon coupling, making this material a unique candidate for observing a light-induced topological phase transition. By using time- and angle-resolved photoelectron spectroscopy (trARPES), we reveal that upon near-infrared photoexcitation the Peierls gap is modulated by displacively excited coherent phonons with $\mathrm{A_{1g}}$ symmetry as well as chiral-symmetry-breaking $\mathrm{E'_{LO}}$ modes. By comparison with state-of-the-art TDDFT+U calculations, we reveal the microscopic origin of the in-phase oscillations of band edges, due to phonon-induced modulation of the effective Hubbard $U$ term., Comment: 6 pages, 3 figures
- Published
- 2024