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arXiv 2403.15340cond-mat.mes-hall
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马约拉纳束缚态的光子交叉噪声谱

Photonic cross-noise spectroscopy of Majorana bound states

Lena Bittermann, Fernando Dominguez, Patrik Recher

AI总结:

我们提出通过pnp结中量子点与拓扑超导体耦合产生光子,利用交叉相关散粒噪声谱和光子偏振探测马约拉纳束缚态,可区分拓扑MBSs与平凡qMBSs,并验证方案对非相关准粒子的鲁棒性。

摘要:

我们提出了一种通过将拓扑超导体与pnp结中的量子点(QDs)耦合来探测马约拉纳束缚态(MBSs)的途径。在此方案中,两个MBSs与两个量子点上的电子相干耦合,这些电子与空穴复合并产生光子。我们重点研究了交叉相关散粒噪声的光谱以及发射光子的偏振。我们的探测方案能够探测MBSs出现的必要条件,具体而言,即非局域三重态超导关联的存在,以及两个MBSs构成一个单一复费米子这一基本性质。我们将我们的结果与非拓扑准MBSs(qMBSs)所得结果进行比较,并建立了交叉相关峰数量与系统中MBSs数量之间的对应关系。在此,我们可以识别出一种隧穿区间,该区间有助于区分拓扑MBSs与平凡qMBSs。此外,我们还通过添加不相关的准粒子来测试该探测方案的鲁棒性。

英文摘要:

We propose a route to detect Majorana bound states (MBSs) by coupling a topological superconductor to quantum dots (QDs) in a $pnp$ junction. Here, two MBSs are coherently coupled to electrons on two QDs, which recombine with holes to photons. We focus on the spectroscopy of cross-correlated shot noise and the polarization of the emitted photons. Our detection scheme allows us to probe the necessary condition for the emergence of MBSs, specifically, the existence of nonlocal triplet superconducting correlations and also the fundamental property that two MBSs comprise a single complex fermion. We compare our results to the ones obtained from nontopological quasi-MBSs (qMBSs) and establish a correspondence between the number of peaks in the cross-correlation with the number of MBSs in the system. Here, we can identify a tunneling regime that facilitates differentiation between topological MBSs and trivial qMBSs. Additionally, we test the robustness of the detection scheme by the addition of uncorrelated quasiparticles.

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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