arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2109.08200cond-mat.mes-hallcond-mat.supr-con
收藏

铁基超导体Fe(Te,Se)的零能Andreev束缚态

Zero-energy Andreev bound states in iron-based superconductor Fe(Te,Se)

Zhe Hou, Jelena Klinovaja

摘要:

马约拉纳束缚态已被预言存在于拓扑超导体(SC)的涡旋中。在铁基SC Fe(Te,Se)中,基于接近$s$波SC的三维拓扑绝缘体的Fu-Kane模型的实现在几个实验中观察到明显的零能量偏置峰后引起了人们的强烈兴趣。在这里,我们表明,考虑到不均匀性的化学势或潜在的杂质的存在下的表面上的Fe(Te,Se),这些零能量偏置峰的出现可以解释由平凡的Andreev束缚态(ABS),其能量接近于零。我们的数值模拟表明,ABS的行为类似于马约拉纳束缚态。ABS只局限于,说,顶面上,并不能区分与STM提示进行运输实验中的拓扑对应。因此,这种ABS值得仔细研究。

英文摘要:

Majorana bound states have been predicted to exist in vortices of topological superconductors (SC). A realization of the Fu-Kane model, based on a three-dimensional topological insulator brought into proximity to an $s$-wave SC, in iron-based SC Fe(Te,Se) has attracted strong interest after pronounced zero-energy bias peaks were observed in several experiments. Here, we show that, by taking into account inhomogeneities of the chemical potential or the presence of potential impurities on the surface of Fe(Te,Se), the emergence of these zero-energy bias peaks can be explained by trivial Andreev bound states (ABSs) whose energies are close to zero. Our numerical simulations reveal that the ABSs behave similarly to Majorana bound states. ABSs are localized only on the, say, top surface and cannot be distinguished from their topological counterparts in transport experiments performed with STM tips. Thus, such ABSs deserve a careful investigation of their own.

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。

↑