Theory of Floquet band formation and local pseudospin textures in pump-probe photoemission of graphene
Year: 2015
Type: article
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. Condensed matter research has seen prominent recent advances in ultrafast optical manipulation and topological materials. Here, Sentef et al. simulate the development of the photoemission-measured band structure of Floquet states in graphene excited by low-frequency circularly-polarized laser pulses.
Source: Nature Communications
DOI: 10.1038/ncomms8047
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $6,990
Funders: U.S. Department of Energy, National Energy Research Scientific Computing Center, Office of Science, Japan Society for the Promotion of Science, Basic Energy Sciences, Laboratory Directed Research and Development, Lawrence Berkeley National Laboratory, Division of Materials Sciences and Engineering
Awards: G1079818582, G1143651532, NEW: CMCSN: COMPUTATIONAL TIME-RESOLVED AND RESONANT X-RAY SCATTERING OF STRONGLY CORRELATED MATERIALS; PI-ARUN BANSIL, G122673668, G1229526393, G1286236842, G1286251239, G1414775356, G1445641779, G1677143136, G1816284028, G1835694930, Theory of nonequilibrium strongly correlated systems, K-EDGE RESONANT INELASTIC X-RAY SCATTERING IN STRONGLY CORRELATED MATERIALS, G213222014, G2173773851, G222768804, G2371548206, G237429762, G2525601846, G2618837358, G2810384502, G2857863752, G303061748, G30714459, G3083819904, G365575497, G3702897590, G3884951186, G419881185, G42916606, G4501827968, G495301720, G498139845, G5076365615, G5296923526, G5364297792, G5480102377, G5570207115, G5648016710, G5849692847, K-EDGE RESONANT INELASTIC X-RAY SCATTERING IN STRONGLY CORRELATED MATERIALS, G650090426, G654302390, G6550344761, G6652958823, K-EDGE RESONANT INELASTIC X-RAY SCATTERING IN STRONGLY CORRELATED MATERIALS, G7283024673, G7354628648, G791371132, G805243471, G8382000481, G911061179, G95070906, G969889393
OpenAlex ID: W2269894729