论文标题

Aharonov-bohm干扰作为Majorana Fermions的探测

Aharonov-Bohm interference as a probe of Majorana fermions

论文作者

Bartolo, T. C., Smith, J. S., Muralidharan, B., Müller, C., Stace, T. M., Cole, J. H.

论文摘要

Majorana Fermions充当自己的反颗粒,长期以来人们被认为仅限于纯理论领域。然而,对它们的兴趣最近浮出水面,因为通过基塔耶夫的工作实现了一些实验可访问的冷凝物质系统可以将这些异国情调的激发托管为一维链边界的界限,并且它们的拓扑和非阿伯式性质具有量子计算的希望。明确地检测主要界面状态的实验特征已变得具有挑战性,因为许多其他现象导致了类似的实验行为。在这里,我们在计算上研究了由两个基塔夫模型链组成的环,它们之间的隧道耦合,其中施加的磁场允许通过所得环结构在运输中进行Aharonov-Bohm干扰。我们使用非平衡的绿色功能技术在存在和不存在Majorana零模式下分析环的传输特性。此外,我们表明,在存在磁场的情况下,这些结果对弱混乱是可靠的。该计算模型建议在具有环路几何形状的设备的磁场依赖性中找到这些拓扑保护结合状态的另一个签名。

Majorana fermions act as their own antiparticle, and they have long been thought to be confined to the realm of pure theory. However, interest in them has recently resurfaced, as it was realized through the work of Kitaev that some experimentally accessible condensed matter systems can host these exotic excitations as bound states on the boundaries of 1D chains, and that their topological and non-abelian nature holds promise for quantum computation. Unambiguously detecting the experimental signatures of Majorana bound states has turned out to be challenging, as many other phenomena lead to similar experimental behaviour. Here, we computationally study a ring comprised of two Kitaev model chains with tunnel coupling between them, where an applied magnetic field allows for Aharonov-Bohm interference in transport through the resulting ring structure. We use a non-equilibrium Green's function technique to analyse the transport properties of the ring in both the presence and absence of Majorana zero modes. Further, we show that these results are robust against weak disorder in the presence of an applied magnetic field. This computational model suggests another signature for the presence of these topologically protected bound states can be found in the magnetic field dependence of devices with loop geometries.

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