Cooperative robustness to static disorder: Superradiance and localization in a nanoscale ring to model light-harvesting systems found in nature

Fausto Borgonovi, Giuseppe Celardo, Giulio Giuseppe Giusteri

Risultato della ricerca: Contributo in rivistaArticolo in rivista

36 Citazioni (Scopus)

Abstract

We analyze a one-dimensional ring structure composed of many two-level systems, in the limit where only one excitation is present. The two-level systems are coupled to a common environment, where the excitation can be lost, which induces super- and subradiant behavior, an example of cooperative quantum coherent effect. We consider time-independent random fluctuations of the excitation energies. This static disorder, also called inhomogeneous broadening in literature, induces Anderson localization and is able to quench superradiance. We identify two different regimes: (i) weak opening, in which superradiance is quenched at the same critical disorder at which the states of the closed system localize; (ii) strong opening, with a critical disorder strength proportional to both the system size and the degree of opening, displaying robustness of cooperativity to disorder. Relevance to photosynthetic complexes is discussed.
Lingua originaleEnglish
pagine (da-a)075113-1-075113-10
Numero di pagine10
RivistaPHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS
Volume90
DOI
Stato di pubblicazionePubblicato - 2014

Keywords

  • light-harvesting
  • open quantum system
  • quantum transport

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