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arXiv 1508.01481cond-mat.supr-con
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相互作用Majorana费米子的奇频率配对

Odd frequency pairing of interacting Majorana fermions

Zhoushen Huang, P. Wolfle, A. V. Balatsky

摘要:

马约拉纳费米子正在成为量子计算中一个有前途的关键组成部分。虽然流行的方法是使用二次(即非相互作用)马约拉纳哈密顿量,但当用狄拉克费米子表示时,一般哈密顿量涉及相互作用项。在这里,我们集中在一个简单的模型系统中可能的配对相关性。我们研究了一个模型的马约拉纳费米子耦合到玻色子模式,并表明,不同的马约拉纳费米子之间的异常相关,位于两端的拓扑线,表现出奇怪的频率行为。当耦合强度$g$高于临界值$g_c$时,它是稳定的。我们使用传统的图解理论和泛函积分方法来推导能隙方程、临界温度、能隙函数、临界耦合和金斯伯格-朗道理论,从而可以讨论偶频配对的可能的次要混合物。

英文摘要:

Majorana fermions are rising as a promising key component in quantum computation. While the prevalent approach is to use a quadratic (i.e. non-interacting) Majorana Hamiltonian, when expressed in terms of Dirac fermions, generically the Hamiltonian involves interaction terms. Here we focus on the possible pair correlations in a simple model system. We study a model of Majorana fermions coupled to a boson mode and show that the anomalous correlator between different Majorana fermions, located at opposite ends of a topological wire, exhibits odd frequency behavior. It is stabilized when the coupling strength $g$ is above a critical value $g_c$. We use both, conventional diagrammatic theory and a functional integral approach, to derive the gap equation, the critical temperature, the gap function, the critical coupling, and a Ginzburg-Landau theory allowing to discuss a possible subleading admixture of even-frequency pairing.

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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