Strong quantum scarring by local impurities.

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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Luukko PJ,Drury B,Klales A,Kaplan L,Heller EJ,Räsänen E

doi

10.1038/srep37656

subject

Has Abstract

pub_date

2016-11-28 00:00:00

pages

37656

issn

2045-2322

pii

srep37656

journal_volume

6

pub_type

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