In a polaron, an electron and the lattice distortion that it induces in a crystal form a 'quasiparticle'. But a strong electric field can displace the two constituents with respect to each other, giving a glimpse at the polaron's internal dynamics.
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Averitt, R. Quasiparticles undressed. Nature Phys 4, 14–15 (2008). https://doi.org/10.1038/nphys826
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DOI: https://doi.org/10.1038/nphys826
