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arXiv 1909.06360cond-mat.supr-concond-mat.mes-hall
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Majorana费米子的维数调谐与Chern数的实空间计数

Dimensional Tuning of Majorana Fermions and the Real Space Counting of the Chern Number

Eric Mascot, Sagen Cocklin, Stephan Rachel, Dirk K. Morr

摘要:

我们证明,它是可能的,使用原子操纵技术,以精确地调整之间的一维和二维拓扑超导体的磁体-超导体混合(MSH)结构。这使得人们可以改变本地化的束缚态和手征马约拉纳边缘模式之间的相关马约拉纳费米子的性质,并提供了一种新的方法来计算系统的拓扑不变量-陈数-在真实的空间。此外,我们表明,有限大小的MSH结构的拓扑性质可以使用陈数密度,其特征在于宏观的,拓扑不变的拓扑超导体的特征在于由一个整数陈数的MSH结构的几何连接。这些结果为利用原子操纵技术研究MSH结构中拓扑超导性的性质开辟了新的可能性。

英文摘要:

We demonstrate that it is possible to use atomic manipulation techniques to adiabatically tune between one-dimensional and two-dimensional topological superconductors in magnet--superconductor hybrid (MSH) structures. This allows one to change the nature of the associated Majorana fermions between localized bound states and chiral Majorana edge modes, and provides a new approach for counting the topological invariant of the system -- the Chern number -- in real space. Moreover, we show that the topological nature of finite-size MSH structures can be characterized using the Chern number density which adiabatically connects MSH structures to macroscopic, translationally invariant topological superconductors characterized by an integer Chern number. These results open new possibilities for studying the nature of topological superconductivity in MSH structures using atomic manipulation techniques.

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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