Josephson current in carbon nanotubes with spin-orbit interaction.
Josephson current in carbon nanotubes with spin-orbit interaction.
复制标题
DOI：
10.1103/physrevlett.107.196801
复制
发表时间：
2011-04
影响因子：
8.6
通讯作者：
J. Lim;Rosa López;R. Aguado
中科院分区：
文献类型：
--
作者：
J. Lim;Rosa López;R. Aguado
我们证明了曲率诱导的自旋-轨道耦合在通过耦合到超导引线的碳纳米管量子点的约瑟夫森电流中诱导了0-π跃迁。在非相互作用的制度，过渡可以通过施加一个平行的磁场附近的临界场，轨道状态变得简并调谐。此外，在库仑阻塞和cotunneling制度的充电和自旋轨道效应之间的相互作用，导致一个丰富的相图与定义明确的（分析）参数空间中的边界。最后，0相总是在近藤政权中占上风。我们的计算是相关的，鉴于最近的实验进展，通过超净碳纳米管运输。
We demonstrate that curvature-induced spin-orbit coupling induces a 0-π transition in the Josephson current through a carbon nanotube quantum dot coupled to superconducting leads. In the noninteracting regime, the transition can be tuned by applying a parallel magnetic field near the critical field where orbital states become degenerate. Moreover, the interplay between charging and spin-orbit effects in the Coulomb blockade and cotunneling regimes leads to a rich phase diagram with well-defined (analytical) boundaries in parameter space. Finally, the 0 phase always prevails in the Kondo regime. Our calculations are relevant in view of recent experimental advances in transport through ultraclean carbon nanotubes.