Sequence-dependent spin-selective tunneling along double-stranded DNA
Sequence-dependent spin-selective tunneling along double-stranded DNA
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沿着双链 DNA 的序列依赖性自旋选择性隧道
DOI：
10.1103/physrevb.86.115441
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发表时间：
2012-08
影响因子：
3.7
通讯作者：
Qing-feng Sun
中科院分区：
文献类型：
--
作者：
Ai-Min Guo;Qing-feng Sun
我们报道了电子在夹在非磁性引线之间的双链DNA上的自旋选择性隧穿。在包含自旋-轨道相互作用和退相的哈密顿量模型的基础上，利用Landauer-B-uttiker公式计算了天然和人造DNA分子的电导和自旋极化。结果表明，自旋过滤效率强烈地依赖于DNA序列，并由其末端片段决定。基因组和人造DNA分子都可以成为有效的自旋过滤器。自旋过滤效应对末端发生的点突变很敏感。这些结果与最近的实验结果一致，对各种无序类型的自旋电子器件具有很强的鲁棒性，有助于设计基于DNA的自旋电子器件。
We report spin-selective tunneling of electrons along double-stranded DNA sandwiched between nonmagnetic leads. On the basis of a model Hamiltonian which contains spin-orbit interaction and dephasing, the conductance and the spin polarization are calculated for natural and artificial DNA molecules by using the Landauer-B\"uttiker formula. Our results reveal that the spin filtration efficiency strongly depends on the DNA sequence and is dominated by its end segment. Both genomic and artificial DNA molecules could be efficient spin filters. The spin-filtering effects are sensitive to point mutation which occurs in the end segment. These results are in good agreement with recent experiments and are robust against various types of disorder, and could help for designing DNA-based spintronic devices.