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Majorana bound states in a quantum dot device coupled with a superconductor zigzag chain

机译:与超导之字形链耦合的量子点装置中的马约拉纳束缚态

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Research in condensed matter physics on topological insulators and superconductors has contributed greatly to the characterization of the surface properties and zero modes of nanowires. In this work we investigated theoretically, using the recursive Green's function approach, electron transport through a T-shaped single-level spinless quantum dot, connected to a zigzag chain and coupled to a p-wave superconductor. This model is an extension of the Kitaev chain for a triangular network of finite size with three, four, and five sites. We found that the Majorana zero modes can be tuned through the coupling parameters of the device and that the linear conductance shows Majorana bound states (MBS) in the topological phase, being maximally robust in the general topological phase. This more realistic model permits the detection of MBS via control of the parameters governing the electronic tunneling and could be helpful for relevant experiments.
机译:拓扑绝缘体和超导体的凝聚态物理研究为纳米线的表面特性和零模态表征做出了巨大贡献。在这项工作中,我们使用递归格林函数方法从理论上进行了研究,即电子通过T型单能级无旋量子点传输,该量子点与之字形链相连并与p波超导体耦合。该模型是Kitaev链的扩展,用于具有三个,四个和五个位置的有限大小的三角形网络。我们发现,可以通过设备的耦合参数来调整Majorana零模式,并且线性电导在拓扑阶段显示Majorana束缚态(MBS),在常规拓扑阶段具有最大的鲁棒性。这种更现实的模型允许通过控制电子隧穿参数的控制来检测MBS,并可能有助于相关实验。

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