Light-induced renormalization of the band structure of chiral tellurium

Year: 2024

Type: article

Abstract: 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.

Source: Physical Review Materials

DOI: 10.1103/physrevmaterials.8.125001

Authors: G. Gatti, N. Tancogne-Dejean, H. Hübener, U. De Giovannini, J. Dai, S. Polishchuk, Ph. Bugnon, F. Frassetto, L. Poletto, M. Chergui, M. Grioni, A. Rubio, M. Puppin, A. Crepaldi

Institutions: University of Geneva, Max Planck Institute for the Structure and Dynamics of Matter, University of Palermo, ALBA Synchrotron (Spain), École Polytechnique Fédérale de Lausanne, National Research Council, University of the Basque Country, Flatiron Institute, Politecnico di Milano

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: National Science Foundation, U.S. Department of Energy, American Institute of Mathematics, Flatiron Health, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Politecnico di Milano, Office of Science, Horizon 2020 Framework Programme, H2020 European Research Council, NCCR Catalysis

OpenAlex ID: W4405736835