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arXiv 1008.1600cond-mat.mes-hall
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多电子碳纳米管中的门控自旋轨道耦合

Gate-dependent spin-orbit coupling in multi-electron carbon nanotubes

Thomas Sand Jespersen, Kasper Grove-Rasmussen, Jens Paaske, Koji Muraki, Toshimasa Fujisawa, Jesper Nygård, Karsten Flensberg

摘要:

了解电子的轨道运动如何与纳米尺度系统中的自旋自由度耦合,对于基于自旋的电子学和量子计算的应用至关重要。我们证明了这种耦合的自旋和轨道的碳纳米管量子点在一般的多电子制度存在有限的无序。此外,我们发现一个强大的系统依赖的自旋轨道耦合的电子占据的量子点。这种依赖性,甚至包括符号变化,在任何其他系统中都没有得到证明,并且是从底层石墨烯晶格的曲率诱导的自旋轨道分裂Dirac光谱得出的。我们的研究结果清楚地表明,自旋轨道耦合是纳米管量子点的一个普遍性质,这为自旋轨道效应的研究及其应用提供了一个独特的平台。

英文摘要:

Understanding how the orbital motion of electrons is coupled to the spin degree of freedom in nanoscale systems is central for applications in spin-based electronics and quantum computation. We demonstrate this coupling of spin and orbit in a carbon nanotube quantum dot in the general multi-electron regime in presence of finite disorder. Further, we find a strong systematic dependence of the spin-orbit coupling on the electron occupation of the quantum dot. This dependence, which even includes a sign change is not demonstrated in any other system and follows from the curvature-induced spin-orbit split Dirac-spectrum of the underlying graphene lattice. Our findings unambiguously show that the spin-orbit coupling is a general property of nanotube quantum dots which provide a unique platform for the study of spin-orbit effects and their applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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