Selective scattering between Floquet–Bloch and Volkov states in a topological insulator
By F. Mahmood, Ching-Kit Chan, Z. Alpichshev, D. Gardner, Young S. Lee, Patrick Lee, N. Gedik. Nature Physics, 2015
355 citations recorded by the source corpus.
Time- and angle-resolved photoelectron spectroscopy experiments are used to monitor the transition between Floquet–Bloch and Volkov states in the topological insulator Bi2Se3. The coherent optical manipulation of solids is emerging as a promising way to engineer novel quantum states of matter1,2,3,4,5. The strong time-periodic potential of intense laser light can be used to generate hybrid photon–electron states. Interaction of light with Bloch states leads to Floquet–Bloch states, which are essential in realizing new photo-induced quantum phases6,7,8. Similarly, dressing of free-electron states near the surface of a solid generates Volkov states, which are used to study nonlinear optics in atoms and semiconductors9. The interaction of these two dynamic states with each other remains an open experimental problem. Here we use time- and angle-resolved photoemission spectroscopy (Tr-ARPES) to selectively study the transition between these two states on the surface of the topological insulator Bi2Se3. We find that the coupling between the two strongly depends on the electron momentum, providing a route to enhance or inhibit it. Moreover, by controlling the light polarization we can negate Volkov states to generate pure Floquet–Bloch states. This work establishes a systematic path for the coherent manipulation of solids via light–matter interaction.
Subfields: Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/3f10201bed109d91ceb4c4da484f1dc00ee4c46d
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Angle-resolved photoemission studies of quantum materials (2020, neutral): “…amplification and difference frequency generation exist for frequency down-conversion, though their widespread application to trARPES is still relatively unexplored due to nontrivial demands on laser technology (Gierz et al., 2015; Mahmood et al., 2016; Reimann et al., 2018; Wang et al., 2013c).”
- Colloquium: Nonthermal pathways to ultrafast control in quantum materials (2021, methodology): “(b) Examples include proposals and experimental realizations of new electronic band structures (Mahmood et al., 2016; Wang et al., 2013), the manipulation of band topologies (Kitagawa et al.”