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arXiv 1206.6959cond-mat.str-elcond-mat.supr-con
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LaAlO3/SrTiO3界面的磁有序和超导有序

Magnetic and Superconducting Ordering at LaAlO3/SrTiO3 Interfaces

Lukasz Fidkowski, Hong-Chen Jiang, Roman M. Lutchyn, Chetan Nayak

摘要:

我们制定了一个模型的磁性和超导有序在LaAlO 3/SrTiO 3界面包含本地化的磁矩和巡回电子。虽然这两个起源于Ti 3d轨道,前者可能是由于电子更紧密地绑定到界面,而后者是在几个层上扩展。只有后者对金属导电性和超导性有重要贡献。在我们的模型中,两种类型的电子之间的相互作用,这被认为是铁磁性的,结合强自旋轨道耦合的巡回电子,导致磁有序。此外,我们提出了一个模型的界面超导性,包括随机超导晶粒在体STO驱动,通过耦合到界面导带,向远程或准远程秩序。最有趣的是,磁序和强自旋轨道耦合可以以这种方式导致非常规的界面超导性,从而可能实现马约拉纳物理。

英文摘要:

We formulate a model for magnetic and superconducting ordering at LaAlO3/SrTiO3 interfaces containing both localized magnetic moments and itinerant electrons. Though these both originate in Ti 3d orbitals, the former may be due to electrons more tightly-bound to the interface while the latter are extended over several layers. Only the latter contribute significantly to metallic conduction and superconductivity. In our model, the interplay between the two types of electrons, which is argued to be ferromagnetic, combined with strong spin-orbit coupling of the itinerant electrons, leads to magnetic ordering. Furthermore, we propose a model for interfacial superconductivity, consisting of random superconducting grains in the bulk STO driven, via coupling to the interface conduction band, towards long-ranged or quasi-long-ranged order. Most interestingly, the magnetic order and strong spin orbit coupling can lead in this manner to unconventional interfacial superconductivity, yielding a possible realization of Majorana physics.

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