Helical Modes in Carbon Nanotubes Generated by Strong Electric Fields
Helical Modes in Carbon Nanotubes Generated by Strong Electric Fields
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DOI：
10.1103/physrevlett.106.156809
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发表时间：
2011-04-15
影响因子：
8.6
通讯作者：
Loss, Daniel
中科院分区：
文献类型：
--
作者：
Klinovaja, Jelena;Schmidt, Manuel J.;Loss, Daniel
螺旋模式，在相反的方向进行相反的自旋，存在于金属扶手椅纳米管在全电设置。这是自旋轨道相互作用和强电场之间相互作用的结果。通过施加额外的磁场，也可以在手性金属纳米管中获得螺旋状区域。特别地，可以仅在两个狄拉克点中的一个处获得螺旋模式，而另一个保持间隙。从紧束缚模型出发，我们推导出有效的低能哈密顿量和由此产生的谱。
Helical modes, conducting opposite spins in opposite directions, are shown to exist in metallic armchair nanotubes in an all-electric setup. This is a consequence of the interplay between spin-orbit interaction and strong electric fields. The helical regime can also be obtained in chiral metallic nanotubes by applying an additional magnetic field. In particular, it is possible to obtain helical modes at one of the two Dirac points only, while the other one remains gapped. Starting from a tight-binding model we derive the effective low-energy Hamiltonian and the resulting spectrum.