Observation of Floquet states in graphene

Floquet engineering-the coherent dressing of matter via time-periodic perturbations-is a mechanism to realize and control emergent phases in materials out of equilibrium. However, its applicability to metallic quantum materials and semimetals such as graphene is an open question. The report of light-induced anomalous Hall effect in graphene remains debated, and a time-resolved photoemission experiment has suggested that Floquet effects might not be realizable in graphene and other semimetals with relatively short decoherence times. Here we provide direct spectroscopic evidence of Floquet effects in graphene through electronic structure measurements. We observe light-matter-dressed Dirac bands by measuring the…

• EC
  European Commission

  Award: 101124492
• DF
  Deutsche Forschungsgemeinschaft

  Awards: 432680300/CRC 1456, QuantumFrontiers-390837967, EXC-2123 QuantumFrontiers, 432680300, 390837967, FOR5242, 217133147/CRC 1073, 217133147, EXC-2123 QuantumFrontiers-390837967, CRC 1073, CRC 1456, EXC-2123, Pi385/3-1
• SN
  Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

  Awards: PZ00P2, PZ00P2-193527, 193527
• CS
  Centro Svizzero di Calcolo Scientifico
• NS
  National Supercomputing Centre Singapore
• H2
  Horizon 2020 Framework Programme

  Award: 101124492