Górski G, Barański J, Weymann I, Domański T
Faculty of Mathematics and Natural Sciences, University of Rzeszów, 35-310, Rzeszów, Poland.
Polish Air Force Academy, ul. Dywizjonu 303, 08-521, Dęblin, Poland.
Sci Rep. 2018 Oct 24;8(1):15717. doi: 10.1038/s41598-018-33529-1.
We study the low energy spectrum and transport properties of a correlated quantum dot coupled between normal and superconducting reservoirs and additionally hybridized with a topological superconducting nanowire, hosting the Majorana end-modes. In this setup the Majorana quasiparticle leaking into the quantum dot can be confronted simultaneously with the on-dot pairing and correlations. We study this interplay, focusing on the quantum phase transition from the spinless (BCS-type) to the spinful (singly occupied) configuration, where the subgap Kondo effect may arise. Using the selfconsistent perturbative treatment for correlations and the unbiased numerical renormalization group calculations we find that the Majorana mode has either constructive or destructive effect on the low-energy transport behavior of the quantum dot, depending on its spin. This spin-selective influence could be verified by means of the polarized STM spectroscopy.
我们研究了一个与正常和超导库耦合、并额外与承载马约拉纳端模式的拓扑超导纳米线杂化的关联量子点的低能谱和输运性质。在这种设置下，泄漏到量子点中的马约拉纳准粒子可以同时与量子点上的配对和关联相互作用。我们研究这种相互作用，重点关注从无自旋（BCS型）到有自旋（单占据）构型的量子相变，此时可能会出现亚能隙近藤效应。使用关联的自洽微扰处理和无偏数值重整化群计算，我们发现马约拉纳模式对量子点的低能输运行为具有建设性或破坏性影响，这取决于其自旋。这种自旋选择性影响可以通过极化STM光谱法来验证。
