Light-induced renormalization of the band structure of chiral tellurium

Le résumé fourni par la source

Chirality in tellurium arises from a Peierls distortion driven by strong electron-phonon coupling, making this material a unique candidate for observing a light-induced topological phase transition. 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 ${\mathrm{A}}_{1\mathrm{g}}$ symmetry as well as chiral-symmetry-breaking ${\mathrm{E}}_{\mathrm{LO}}^{\ensuremath{'}}$ modes. By comparison with state-of-the-art $\mathrm{TDDFT}+\mathrm{U}$ calculations, we reveal the microscopic origin of the in-phase oscillations of band edges, owing to phonon-induced modulation of the effective Hubbard $U$ term.

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