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arXiv 2009.01494hep-ph
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超导体中的宇称破缺与新物理

Parity violation and new physics in superconductors

Deog Ki Hong

摘要:

我们提出了一种新的方法,利用超导体的Andreev反射,测量由标准电弱理论引起的宇称违反,这反过来又限制了新物理学可能的宇称违反效应。弱中性电流在超导体中诱导出宇称违反的边缘有效算子,尽管很小。我们估计它们对超导带隙的影响,并提出了一种方法来测量宇称违反的自旋极化效应,当电子或空穴在正常金属和超导体之间的界面得到Andreev反射。这种极化效应可能与原子宇称破坏相当,因此自然会对某些新物理模型产生有趣的约束,这些模型与电子耦合,例如Majorana质量的活跃中微子或双电荷希格斯粒子。

英文摘要:

We propose a new method, using the Andreev reflection at superconductors, to measure parity violation induced by the standard electroweak theory, which in turn constrains the possible parity-violating effects of new physics. The weak neutral currents induce parity-violating, marginal effective operators, though quite tiny, in superconductors. We estimate their effects on superconducting gaps and propose a method to measure the parity-violation from the spin polarization effect, when electrons or holes get Andreev-reflected at the interface between normal metal and a superconductor. Such polarization effects might be comparable to the atomic parity violation and thus naturally give an interesting bound on certain models of new physics, that couples to electrons, such as Majorana mass of active neutrinos or doubly charged Higgs.

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