Quantum transport anomalies in DNA containing mispairs

Details Quantum transport anomalies in DNA containing mispairs Quantum transport anomalies in DNA containing mispairs

2012-02-08

arxiv.org/abs/1202.1849v1

Nanotechnology 21, 485101 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The effect of mispair on charge transport in a DNA of sequence (GC)(TA)_N(GC)_3 connected to platinum electrodes is studied using the tight-binding model. With parameters derived from ab initio density functional result, we calculate the current versus bias voltage for DNA with and without mispair and for different numbers of (TA) basepairs N between the single and triple (GC) basepairs. The current decays exponentially with $N$ under low bias but reaches a minimum under high bias when a multichannel transport mechanism is established. A (GA) mispair substituting a (TA) basepair near the middle of the (TA)_N sequence usually enhances the current by one order due to its low ionization energy but may decrease the current significantly when an established multichannel mechanism is broken.

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