Observation of Floquet-Bloch States on the Surface of a Topological Insulator

@article{Wang2013ObservationOF,
  title={Observation of Floquet-Bloch States on the Surface of a Topological Insulator},
  author={Y. Wang and Hadar Steinberg and Pablo Jarillo-Herrero and Nuh Gedik},
  journal={Science},
  year={2013},
  volume={342},
  pages={453 - 457}
}
Topological Replicas When a periodic perturbation couples strongly to electrons in a solid, replicas of the original electronic levels are predicted to develop at certain energies—the so-called Floquet-Bloch states. Such conditions can be achieved by shining light on a solid, but the effect is challenging to observe. Wang et al. (p. 453) used time- and angle-resolved photoemission spectroscopy to photoexcite Bi2Se3 and observe its dispersion at various delay times. The replicas were seen at… 

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