Shapir, Errez and Cohen, Hezy and Calzolari, Arrigo and Cavazzoni, Carlo and Ryndyk, Dmitry A. and Cuniberti, Gianaurelio and Kotlyar, Alexander and Di Felice, Rosa and Porath, Danny (2008) Electronic structure of single DNA molecules resolved by transverse scanning tunnelling spectroscopy. NATURE MATERIALS, 7 (1). pp. 68-74. ISSN 1476-1122,
Full text not available from this repository. (Request a copy)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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ISOLATED C-60 MOLECULES; OPTICAL SPECTROSCOPY; CONTRAST MECHANISM; DOUBLE HELIX; CONDUCTANCE; MICROSCOPY; TRANSPORT; PSEUDOPOTENTIALS; VISUALIZATION; ENVIRONMENT; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Nov 2020 06:21 |
| Last Modified: | 23 Nov 2020 06:21 |
| URI: | https://pred.uni-regensburg.de/id/eprint/31727 |
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