Exciton-Plasmon States in Nanoscale Materials: Breakdown of the Tamm-Dancoff Approximation
Data(s) |
12/08/2009
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Resumo |
<p>Within the Tamm-Dancoff approximation, ab initio approaches describe excitons as packets of electron-hole pairs propagating only forward in time. However, we show that in nanoscale materials excitons and plasmons hybridize, creating exciton-plasmon states where the electron-hole pairs oscillate back and forth in time. Then, as exemplified by the trans-azobenzene molecule and the carbon nanotubes, the Tamm-Dancoff approximation yields errors larger than the accuracy claimed in ab initio calculations. Instead, we propose a general and efficient approach that avoids the Tamm-Dancoff approximation, correctly describes excitons, plasmons, and exciton-plasmon states, and provides a good agreement with experimental results.</p> |
Identificador | |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Gruning , M , Marini , A & Gonze , X 2009 , ' Exciton-Plasmon States in Nanoscale Materials: Breakdown of the Tamm-Dancoff Approximation ' Nano Letters , vol 9 , no. 8 , pp. 2820-2824 . DOI: 10.1021/nl803717g |
Tipo |
article |