Gutierrez, Rafael and Mandal, S. and Cuniberti, Gianaurelio (2005) Dissipative effects in the electronic transport through DNA molecular wires. PHYSICAL REVIEW B, 71 (23): 235116. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
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 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 pseudogap is formed. As a result, a crossover from tunneling to activated 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(E-F), manifests an Arrhenius-type behavior in agreement with recent transport experiments. Moreover, t(E-F) shows a weak exponential dependence on the wire length, typical of strong incoherent transport. Disorder effects smear the electronic bands, but do not appreciably affect the pseudogap formation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DOUBLE-HELICAL DNA; CHARGE-TRANSPORT; LAMBDA-DNA; BEHAVIOR; MODEL; MIGRATION; DYNAMICS; DISORDER; SOLVENT; DEVICES; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Alumni or Retired Professors > Group Gianaurelio Cuniberti |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 May 2021 10:49 |
| Last Modified: | 11 May 2021 10:49 |
| URI: | https://pred.uni-regensburg.de/id/eprint/36097 |
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