Skip to content.

TUD

search  |  internal  |  deutsch
Personal tools
TU Dresden » Faculty of Mechanical Science and Engineering » Institute for Materials Science » Chair of Materials Science and Nanotechnology


prev/next pubs | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996

[back]


55. 


Dissipative effects in the electronic transport through DNA molecular wires



R. Gutiérrez, S. Mandal, and G. Cuniberti

Physical Review B 71, 235116 (2005)

Selected for the July 1, 2005 issue of the
Virtual Journal of Biological Physics Research
.

We investigate the influence of a dissipative environment which effectively comprises the effects of counterions and hydration shells, on the transport properties of short DNA wires. Their electronic structure is captured by a tight-binding model which is embedded in a bath consisting of a collection of harmonic oscillators. Without coupling to the bath a temperature independent gap in the electronic spectrum opens in the electronic spectrum. Upon allowing for electron-bath interaction the gap becomes temperature dependent. It increases with temperature in the weak-coupling limit to the bath degrees of freedom. In the strong-coupling regime a bath-induced pseudo-gap is formed. As a result, a crossover from semiconducting to metallic behavior in the low-voltage region of the I-V characteristics is observed with increasing temperature. The temperature dependence of the transmission near the Fermi energy, t(EF), manifests an Arrhenius-like behavior in agreement with recent transport experiments. Moreover, t(EF) shows a weak exponential dependence on the wire length, typical of strong incoherent transport. Disorder e ects smear the electronic bands, but do not appreciably affect the pseudo-gap formation.



online .pdf paper (for personal use only)online .pdf paper (for personal use only)
doi absolute link10.1103/PhysRevB.71.235116
online abstract at the publisher site
publisher site (ISSN:1550-235X)
online abstractarXiv preprint: cond-mat/0507565
CiteBaseCiteBase
seleceted abstractVJ Nanoscale Science & Technology entry
export BibTeX citation (txt file)
export EndNote citation (ris file)
IF(2005): 3.185


prev/next 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996

[back]



















































last modified: 2017.05.22 Mo
author: webadmin