Baba, Yuriko and Junk, Vanessa and Hogger, Wolfgang and Dominguez-Adame, Francisco and Molina, Rafael A. and Richter, Klaus (2025) Radiation-induced dynamical formation of Floquet-Bloch bands in Dirac Hamiltonians. NEW JOURNAL OF PHYSICS, 27 (4): 043015. ISSN 1367-2630
Full text not available from this repository. (Request a copy)Abstract
Recent experiments, combing ultrafast strong-field irradiation of surfaces with time- and angle-resolved photoemission spectroscopy, allow for monitoring the time-dependent charge carrier dynamics and the build-up of transient sidebands due to the radiation pulses. While these structures are reminiscent of Floquet-Bloch bands, standard Floquet theory is not applicable since it requires a strictly time-periodic driving field. To study the emergence and formation of such sidebands, i.e. to provide a link between common Floquet physics and dynamical mechanisms underlying short driving pulses, we consider a generalization of Floquet theory, the so-called t-t ' formalism. This approach naturally extents Floquet theory to driving field amplitudes with a superimposed envelope shape. Motivated by experiments we study 2D Dirac Hamiltonians subject to linearly and circularly polarised light waves with a Gaussian field envelope of a few cycles. For these Floquet-Bloch Hamiltonians we study the evolution of their Floquet-Bloch spectra, accompanied by a systematic analysis of the time-dependent (sideband) transitions. We show that sideband occupation requires circularly polarized light for linear Dirac systems such as graphene, while for Dirac models with trigonal warping, describing surface states of topological insulators such as Bi2Se3, both linearly and circularly polarised pulses induce sideband excitations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TOPOLOGICAL-INSULATOR; SCHRODINGER-EQUATION; SCATTERING; SURFACE; STATES; Floquet; Dirac materials; light-matter interaction |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 24 Jun 2026 06:42 |
| Last Modified: | 24 Jun 2026 06:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/67232 |
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