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arXiv 1611.09367cond-mat.mes-hallcond-mat.supr-con
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具有面内磁场的有限带中的Majorana费米子

Majorana fermions in finite-size strips with in-plane magnetic fields

Vardan Kaladzhyan, Julien Despres, Ipsita Mandal, Cristina Bena

摘要:

本文研究了在面内塞曼磁场作用下具有Rashba自旋轨道耦合的准一维系统中产生的Majorana束缚态。使用两种不同的方法,第一,紧束缚哈密顿量的数值对角化,第二,找到哈密顿量的奇点(见参考文献10)。[1-4]),我们得到了这些体系的拓扑相图作为化学势和磁场的函数,并证明了这两种方法的一致性。通过引入无序到这些系统中,我们证实了具有偶数个Majorana对的状态是不拓扑保护的。最后,我们表明,一个正式的计算的$\mathbb{Z}_2$拓扑不变量恢复正确的奇偶性的马约拉纳束缚态对的数量,因此,它是完全符合的无序系统的相图。

英文摘要:

We study the Majorana bound states arising in quasi-one-dimensional systems with Rashba spin-orbit coupling in the presence of an in-plane Zeeman magnetic field. Using two different methods, first, the numerical diagonalization of the tight-binding Hamiltonian, and second, finding the singular points of the Hamiltonian (see Refs. [1-4]), we obtain the topological phase diagram for these systems as a function of the chemical potential and the magnetic field, and we demonstrate the consistency of these two methods. By introducing disorder into these systems we confirm that the states with even number of Majorana pairs are not topologically protected. Finally, we show that a formal calculation of the $\mathbb{Z}_2$ topological invariants recovers correctly the parity of the number of Majorana bound states pairs, and it is thus fully consistent with the phase diagrams of the disordered systems.

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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