Dresden 2017 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 48: Two-dimensional materials IV (joined session with TT)
HL 48.8: Vortrag
Mittwoch, 22. März 2017, 11:45–12:00, POT 51
Driven Hofstadter Butterflies — •Martin Wackerl1 and John Schliemann2 — 1Institut für Theoretische Physik, Universität Regensburg — 2Institut für Theoretische Physik, Universität Regensburg
Periodically driven quantum systems offer a great way of tuning band structures or Chern numbers. The first part will be about graphene illuminated with circular polarized light. The external driving is introduced via the Floquet formalism and the main focus will be on the deformation of the band structure of graphene. Afterwards we will give a short introduction to the Hofstadter butterfly and unify it with the Floquet formalism. We will show how the Hofstadter spectrum gets distorted when tuning the light intensity, photon energy, and polarization. The last part is about the influence of polarized light to the distribution of ground state Chern numbers of the Floquet-Hofstadter spectrum.