Electronic structure of single DNA molecules resolved by transverse scanning tunnelling spectroscopy

Errez Shapir, Hezy Cohen, Arrigo Calzolari, Carlo Cavazzoni, Dmitry A. Ryndyk, Gianaurelio Cuniberti, Alexander Kotlyar, Rosa Di Felice*, Danny Porath

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

143 Scopus citations

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 78 K 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 abinitio 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.

Original languageAmerican English
Pages (from-to)68-74
Number of pages7
JournalNature Materials
Volume7
Issue number1
DOIs
StatePublished - Jan 2008

Bibliographical note

Funding Information:
We thank I. Brodsky, A. Migliore, M. Cavallari and O. Millo for fruitful discussions, and laboratory and computational help. Funding was provided by the EC through contracts IST-2001-38951 (‘DNA-Based Nanowires’) and FP6-029192 (‘DNA-Based Nanodevices’). Computer time was provided by CINECA (Bologna) and by INFM-CNR through National Supercomputing Projects. Correspondence and requests for materials should be addressed to D.P. or R.D.F. Supplementary Information accompanies this paper on www.nature.com/naturematerials.

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