Cargando…

Disorder-assisted quantum transport in suboptimal decoherence regimes

We investigate quantum transport in binary tree structures and in hypercubes for the disordered Frenkel-exciton Hamiltonian under pure dephasing noise. We compute the energy transport efficiency as a function of disorder and dephasing rates. We demonstrate that dephasing improves transport efficienc...

Descripción completa

Detalles Bibliográficos
Autores principales: Novo, Leonardo, Mohseni, Masoud, Omar, Yasser
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4698721/
https://www.ncbi.nlm.nih.gov/pubmed/26726133
http://dx.doi.org/10.1038/srep18142
_version_ 1782408077010534400
author Novo, Leonardo
Mohseni, Masoud
Omar, Yasser
author_facet Novo, Leonardo
Mohseni, Masoud
Omar, Yasser
author_sort Novo, Leonardo
collection PubMed
description We investigate quantum transport in binary tree structures and in hypercubes for the disordered Frenkel-exciton Hamiltonian under pure dephasing noise. We compute the energy transport efficiency as a function of disorder and dephasing rates. We demonstrate that dephasing improves transport efficiency not only in the disordered case, but also in the ordered one. The maximal transport efficiency is obtained when the dephasing timescale matches the hopping timescale, which represent new examples of the Goldilocks principle at the quantum scale. Remarkably, we find that in weak dephasing regimes, away from optimal levels of environmental fluctuations, the average effect of increasing disorder is to improve the transport efficiency until an optimal value for disorder is reached. Our results suggest that rational design of the site energies statistical distributions could lead to better performances in transport systems at nanoscale when their natural environments are far from the optimal dephasing regime.
format Online
Article
Text
id pubmed-4698721
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher Nature Publishing Group
record_format MEDLINE/PubMed
spelling pubmed-46987212016-01-13 Disorder-assisted quantum transport in suboptimal decoherence regimes Novo, Leonardo Mohseni, Masoud Omar, Yasser Sci Rep Article We investigate quantum transport in binary tree structures and in hypercubes for the disordered Frenkel-exciton Hamiltonian under pure dephasing noise. We compute the energy transport efficiency as a function of disorder and dephasing rates. We demonstrate that dephasing improves transport efficiency not only in the disordered case, but also in the ordered one. The maximal transport efficiency is obtained when the dephasing timescale matches the hopping timescale, which represent new examples of the Goldilocks principle at the quantum scale. Remarkably, we find that in weak dephasing regimes, away from optimal levels of environmental fluctuations, the average effect of increasing disorder is to improve the transport efficiency until an optimal value for disorder is reached. Our results suggest that rational design of the site energies statistical distributions could lead to better performances in transport systems at nanoscale when their natural environments are far from the optimal dephasing regime. Nature Publishing Group 2016-01-04 /pmc/articles/PMC4698721/ /pubmed/26726133 http://dx.doi.org/10.1038/srep18142 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Novo, Leonardo
Mohseni, Masoud
Omar, Yasser
Disorder-assisted quantum transport in suboptimal decoherence regimes
title Disorder-assisted quantum transport in suboptimal decoherence regimes
title_full Disorder-assisted quantum transport in suboptimal decoherence regimes
title_fullStr Disorder-assisted quantum transport in suboptimal decoherence regimes
title_full_unstemmed Disorder-assisted quantum transport in suboptimal decoherence regimes
title_short Disorder-assisted quantum transport in suboptimal decoherence regimes
title_sort disorder-assisted quantum transport in suboptimal decoherence regimes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4698721/
https://www.ncbi.nlm.nih.gov/pubmed/26726133
http://dx.doi.org/10.1038/srep18142
work_keys_str_mv AT novoleonardo disorderassistedquantumtransportinsuboptimaldecoherenceregimes
AT mohsenimasoud disorderassistedquantumtransportinsuboptimaldecoherenceregimes
AT omaryasser disorderassistedquantumtransportinsuboptimaldecoherenceregimes