Strong quantum scarring by local impurities
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Strong quantum.pdf
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Author(s)
Luukko, Perttu J. J.
Klales, Anna
Kaplan, Lev
Heller, Eric J.
Räsänen, Esa
Drury, Byron Coffin
Date Issued
November 2016
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Luukko, Perttu J. J. et al. “Strong Quantum Scarring by Local Impurities.” Scientific Reports 6.1 (2016): n. pag.
Version
Final published version
Abstract
We discover and characterise strong quantum scars, or quantum eigenstates resembling classical periodic orbits, in two-dimensional quantum wells perturbed by local impurities. These scars are not explained by ordinary scar theory, which would require the existence of short, moderately unstable periodic orbits in the perturbed system. Instead, they are supported by classical resonances in the unperturbed system and the resulting quantum near-degeneracy. Even in the case of a large number of randomly scattered impurities, the scars prefer distinct orientations that extremise the overlap with the impurities. We demonstrate that these preferred orientations can be used for highly efficient transport of quantum wave packets across the perturbed potential landscape. Assisted by the scars, wave-packet recurrences are significantly stronger than in the unperturbed system. Together with the controllability of the preferred orientations, this property may be very useful for quantum transport applications.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/srep37656
