Spin injection into a short DNA chain

Details Spin injection into a short DNA chain Spin injection into a short DNA chain

2005-12-19

arxiv.org/abs/cond-mat/0512473v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevB.74.193103

Quantun spin transport through a short DNA chain connected to ferromagnetic electrodes has been investigated by the transfer matrix method. We describe the system by a tight-binding model where the parameters are extracted from the experimental data and realistic metal energy bands. For ferromagnetic iron electrodes, the magnetoresistance of a 30-basepair Poly(G)-Poly(C) DNA is found to be lower than 10% at a bias of < 4 V, but can rach up to 20% at a bias of 5 V. In the presence of the spin-flip mechanism, the magnetoresistance is significantly enhanced when the spin-flip coupling is weak but as the coupling becomes stronger the decreasing magnetoresistance develops an oscillatory behavior.

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