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arXiv 1307.2279cond-mat.mes-hall
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具有Majorana费米子的自组织拓扑态

Self-Organized Topological State with Majorana Fermions

M. M. Vazifeh, M. Franz

摘要:

拓扑相,一般来说,很难得到。它们要么发生在相当极端的条件下(例如,量子霍尔液体,其需要高样品纯度、强磁场和低温),要么需要微调系统参数,如在大多数已知的拓扑绝缘体中那样。许多完全合理的拓扑相,如外尔半金属和拓扑超导体,仍然没有被实验发现。在这里,我们介绍了一个系统,其中的一个关键的动力学参数调整自己,以响应不断变化的外部条件,使基态自然有利于拓扑相。该系统由放置在普通s波超导体表面的单个磁性原子形成的量子线组成。它实现了Kitaev范式的拓扑超导性时,波矢量表征新兴的自旋螺旋动态自调谐,以支持拓扑相位。

英文摘要:

Topological phases, quite generally, are difficult to come by. They either occur under rather extreme conditions (e.g. the quantum Hall liquids, which require high sample purity, strong magnetic fields and low temperatures) or demand fine tuning of system parameters, as in the majority of known topological insulators. Many perfectly sensible topological phases, such as the Weyl semimetals and topological superconductors, remain experimentally undiscovered. Here we introduce a system in which a key dynamical parameter adjusts itself in response to the changing external conditions so that the ground state naturally favours the topological phase. The system consists of a quantum wire formed of individual magnetic atoms placed on the surface of an ordinary s-wave superconductor. It realizes the Kitaev paradigm of topological superconductivity when the wavevector characterizing the emergent spin helix dynamically self-tunes to support the topological phase.

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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