Majorana fermions in a tunable semiconductor device
Majorana fermions in a tunable semiconductor device
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DOI：
10.1103/physrevb.81.125318
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发表时间：
2010-03-01
影响因子：
3.7
通讯作者：
Alicea, Jason
中科院分区：
文献类型：
--
作者：
Alicea, Jason
由于Majorana费米子的非阿贝尔性质和在拓扑量子计算中的潜在开发，在实验上实现Majorana费米子是一个重要的问题。最近，Sau[Phys.莱特牧师。104,040502(2010年)]证明了支持马约拉纳费米子的拓扑超导相可以使用令人惊讶的传统构建块来实现：一个耦合到S波超导体的半导体量子井和一个铁磁绝缘体。在这里，我们提出了另一种装置，其中拓扑超导相是通过在只与S波超导体耦合的(110)生长的半导体上施加平面内磁场来驱动的。这种设备提供了许多优点，特别是更简单的架构，以及在很大程度上避免不必要的轨道效应的情况下，跨越量子相变进入拓扑超导状态的能力。对两种装置的实验可行性进行了较为详细的讨论。
The experimental realization of Majorana fermions presents an important problem due to their non-Abelian nature and potential exploitation for topological quantum computation. Very recently Sau [Phys. Rev. Lett. 104, 040502 (2010)] demonstrated that a topological superconducting phase supporting Majorana fermions can be realized using surprisingly conventional building blocks: a semiconductor quantum well coupled to an s-wave superconductor and a ferromagnetic insulator. Here we propose an alternative setup, wherein a topological superconducting phase is driven by applying an in-plane magnetic field to a (110)-grown semiconductor coupled only to an s-wave superconductor. This device offers a number of advantages, notably a simpler architecture and the ability to tune across a quantum phase transition into the topological superconducting state while still largely avoiding unwanted orbital effects. Experimental feasibility of both setups is discussed in some detail.