含吸附原子的非常规超导体的可调拓扑态
Tunable topological states hosted by unconventional superconductors with adatoms
摘要：
磁原子链，放置在s波超导体的表面，已被建立作为研究马约拉纳束缚态的实验室。在这样的系统中，由于磁矩导致的时间反转的中断引起了间隙状态的形成，间隙状态杂交以形成一维拓扑超导体。然而，在非常规超导体中，即使是非磁性杂质也会诱发隙内态，因为库珀对的散射会改变它们的动量，但不会改变它们的相位。在这里，我们提出了一种创建拓扑超导性的方法，它是基于一种非常规的超导体，其表面上有一系列非磁性吸附原子。拓扑相位可以通过调节塞曼场的大小和方向来达到，使得在其边界处的马约拉纳零模式可以被产生、移动和融合。为了证明这个平台的可行性，我们开发了一个一般的映射与吸附原子链的一维晶格哈密顿的电影。这使我们能够研究非常规的超导体，如Sr $_2$ RuO $_4$表现出多个频带和各向异性的序参量。
英文摘要：
Chains of magnetic atoms, placed on the surface of s-wave superconductors, have been established as a laboratory for the study of Majorana bound states. In such systems, the breaking of time reversal due to magnetic moments gives rise to the formation of in-gap states, which hybridize to form one-dimensional topological superconductors. However, in unconventional superconductors even non-magnetic impurities induce in-gap states since scattering of Cooper pairs changes their momentum but not their phase. Here, we propose a path for creating topological superconductivity, which is based on an unconventional superconductor with a chain of non-magnetic adatoms on its surface. The topological phase can be reached by tuning the magnitude and direction of a Zeeman field, such that Majorana zero modes at its boundary can be generated, moved and fused. To demonstrate the feasibility of this platform, we develop a general mapping of films with adatom chains to one-dimensional lattice Hamiltonians. This allows us to study unconventional superconductors such as Sr$_2$RuO$_4$ exhibiting multiple bands and an anisotropic order parameter.
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