Electronic structure of single DNA molecules resolved by transverse scanning tunnelling spectroscopy (Articolo in rivista)

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Label
  • Electronic structure of single DNA molecules resolved by transverse scanning tunnelling spectroscopy (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1038/nmat2060 (literal)
Alternative label
  • Shapir, E; Cohen, H; Calzolari, A; Cavazzoni, C; Ryndyk, DA; Cuniberti, G; Kotlyar, A; Di Felice, R; Porath, D (2008)
    Electronic structure of single DNA molecules resolved by transverse scanning tunnelling spectroscopy
    in Nature materials (Print); Nature Publishing Group, New York (Stati Uniti d'America)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Shapir, E; Cohen, H; Calzolari, A; Cavazzoni, C; Ryndyk, DA; Cuniberti, G; Kotlyar, A; Di Felice, R; Porath, D (literal)
Pagina inizio
  • 68 (literal)
Pagina fine
  • 74 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 7 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • \"[Shapir, Errez; Cohen, Hezy; Porath, Danny] Hebrew Univ Jerusalem, Dept Phys Chem, IL-91904 Jerusalem, Israel; [Shapir, Errez; Cohen, Hezy; Porath, Danny] Hebrew Univ Jerusalem, Ctr Nanosci & Nanotechnol, IL-91904 Jerusalem, Israel; [Calzolari, Arrigo; Cavazzoni, Carlo; Di Felice, Rosa] INFM, CNR, Natl Ctr nanostruct & Biosyst Surfaces S3, I-41100 Modena, Italy; [Cavazzoni, Carlo] CINECA, I-40033 Bologna, Italy; [Ryndyk, Dmitry A.; Cuniberti, Gianaurelio] Univ Regensburg, Inst Theoret Phys, D-93040 Regensburg, Germany; [Kotlyar, Alexander] Tel Aviv Univ, Dept Biochem, George S Wise Fac Life Sci, IL-69978 Tel Aviv, Israel; [Kotlyar, Alexander] Tel Aviv Univ, Nanotechnol Ctr, IL-69978 Tel Aviv, Israel (literal)
Titolo
  • Electronic structure of single DNA molecules resolved by transverse scanning tunnelling spectroscopy (literal)
Abstract
  • Attempts to resolve the energy-level structure of single DNA molecules by scanning tunnelling spectroscopy span over the past two decades, owing to the unique ability of this technique to probe the local density of states of objects deposited on a surface. Nevertheless, success was hindered by extreme technical difficulties in stable deposition and reproducibility. Here, by using scanning tunnelling spectroscopy at cryogenic temperature, we disclose the energy spectrum of poly(G)-poly(C) DNA molecules deposited on gold. The tunnelling current-voltage (I-V) characteristics and their derivative (dI/dV-V) curves at 78K exhibit a clear gap and a peak structure around the gap. Limited fluctuations in the I-V curves are observed and statistically characterized. By means of ab initio density functional theory calculations, the character of the observed peaks is generally assigned to groups of orbitals originating from the different molecular components, namely the nucleobases, the backbone and the counterions. (literal)
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