Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 71: Ultrafast Phenomena
TT 71.7: Talk
Thursday, March 12, 2026, 11:00–11:15, HSZ/0103
Study of light-induced band inversion in SnTe via Ab Initio Calculations — •Asier Ribechini1, Álvaro R. Puente-Uriona1, and Julen Ibañez-Azpiroz1,2,3 — 1Centro de Física de Materiales (CSIC-EHU), 20018, Donostia, Spain — 2IKERBASQUE, Basque Foundation for Science, 48009 Bilbao, Spain — 3Donostia International Physics Center (DIPC), 20018 Donostia, Spain
Modern technology enables precise control of matter through light-matter interactions. Periodically driven quantum systems, described by Floquet theory, offer a powerful framework for predicting light-induced phenomena, including topological phases and quantum phase transitions [1], though their experimental detection remains challenging.
We evaluate the method of our group [2] for computing the Floquet quasienergy spectrum of SnTe using the velocity gauge in a truncated Hilbert space to build the ab initio time-periodic Hamiltonian. From it, we construct the effective Floquet Hamiltonian and obtain the quasienergy spectrum. Our results reveal a light-induced gap opening between conduction and valence band Floquet replicas near resonant driving, as well as a band-character inversion indicative of a possible light-induced topological phase transition. We further compute the corresponding topological invariants to characterize this transition and discuss our findings in relation to recent time-resolved ARPES evidence for light-induced topological behavior[3].
[1] J. I. Inoue et al., Phys. Rev. Lett. 105, 017401 (2010)
[2] Á. R. Puente-Uriona et al., Phys Rev. B 110, 125203 (2024)
[3] F. Chassot et al., arXiv:2502.11967v1
Keywords: Floquet engineering; topology; topological phase transition; nonequilibrium dynamics; periodic driving