Abstract:
:Ultrafast materials science promises optical control of physical properties of solids. Continuous-wave circularly polarized laser driving was predicted to induce a light-matter coupled state with an energy gap and a quantum Hall effect, coined Floquet topological insulator. Whereas the envisioned Floquet topological insulator requires high-frequency pumping to obtain well-separated Floquet bands, a follow-up question regards the creation of Floquet-like states in graphene with realistic low-frequency laser pulses. Here we predict that short optical pulses attainable in experiments can lead to local spectral gaps and novel pseudospin textures in graphene. Pump-probe photoemission spectroscopy can track these states by measuring sizeable energy gaps and Floquet band formation on femtosecond time scales. Analysing band crossings and pseudospin textures near the Dirac points, we identify new states with optically induced nontrivial changes of sublattice mixing that leads to Berry curvature corrections of electrical transport and magnetization.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Sentef MA,Claassen M,Kemper AF,Moritz B,Oka T,Freericks JK,Devereaux TPdoi
10.1038/ncomms8047subject
Has Abstractpub_date
2015-05-11 00:00:00pages
7047issn
2041-1723pii
ncomms8047journal_volume
6pub_type
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