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arXiv 1207.2691cond-mat.mes-hallcond-mat.supr-con
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在1D量子线中设计和操纵拓扑量子位

Engineering and manipulating topological qubits in 1D quantum wires

Panagiotis Kotetes, Alexander Shnirman, Gerd Schön

摘要:

本文研究了在塞曼场存在下,由超导体-超导体一维异质结的拓扑(T)相和正常(N)相组成的TNT和NTN结中的约瑟夫森效应。我们的设置的一个关键特征是,除了超导序参量的相位的变化,我们允许的磁场的方向沿结改变。我们发现一种新的磁贡献的马约拉纳约瑟夫森耦合,允许约瑟夫森电流被调谐通过改变沿结的磁场的方向。我们还预测,自旋电流可以产生一个有限的超导相位差,使这些材料潜在的候选人自旋电子应用。最后,这种新型的耦合不仅构成了马约拉纳束缚态存在的独特指纹,而且还提供了一种在导线网络中操纵和编织拓扑量子位的替代途径。

英文摘要:

We investigate the Josephson effect in TNT and NTN junctions, consisting of topological (T) and normal (N) phases of semiconductor-superconductor 1D heterostructures in the presence of a Zeeman field. A key feature of our setup is that, in addition to the variation of the phase of the superconducting order parameter, we allow the orientation of the magnetic field to change along the junction. We find a novel magnetic contribution to the Majorana Josephson coupling that permits the Josephson current to be tuned by changing the orientation of the magnetic field along the junction. We also predict that a spin current can be generated by a finite superconducting phase difference, rendering these materials potential candidates for spintronic applications. Finally, this new type of coupling not only constitutes a unique fingerprint for the existence of Majorana bound states but also provides an alternative pathway for manipulating and braiding topological qubits in networks of wires.

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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