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Universal Spreading of Wave Packets in Disordered Nonlinear Systems

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Flach, S., Krimer, D. O., Skokos, Ch.·2009·Physical Review Letters

Abstract

In the absence of nonlinearity all eigenmodes of a chain with disorder are spatially localized (Anderson localization). The width of the eigenvalue spectrum and the average eigenvalue spacing inside the localization volume set two frequency scales. An initially localized wave packet spreads in the presence of nonlinearity. Nonlinearity introduces frequency shifts, which define three different evolution outcomes: (i) localization as a transient, with subsequent subdiffusion; (ii) the absence of the transient and immediate subdiffusion; (iii) self-trapping of a part of the packet and subdiffusion of the remainder. The subdiffusive spreading is due to a finite number of packet modes being resonant. This number does not change on average and depends only on the disorder strength. Spreading is due to corresponding weak chaos inside the packet, which slowly heats the cold exterior. The second moment of the packet grows as t;{alpha}. We find alpha=1/3.

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Metadata

Authors
Flach, S., Krimer, D. O., & Skokos, C.
Venue
Physical Review Letters
Published
2009-01-14
Volume
102
Issue
2
Pages
024101-024101
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W2011721894
Cited by
317
References
21
FWCI
27.33
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Universal Spreading of Wave Packets in Disordered Nonlinear Systems. https://app.cochat.ai/papers/10.1103/physrevlett.102.024101
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Flach, S., Krimer, D. O., & Skokos, C. (2009). Universal Spreading of Wave Packets in Disordered Nonlinear Systems. Physical Review Letters. https://doi.org/10.1103/physrevlett.102.024101

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