Leakage of Majorana mode into correlated quantum dot nearby its singlet-doublet crossover

We study quasiparticle spectrum of the correlated quantum dot (QD) deposited on superconducting (SC) substrate which is side-coupled to the Rashba nanochain, hosting Majorana end modes. Ground state of an isolated QD proximitized to SC reservoirs is represented either by the singly occupied site or...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2020-01, Vol.32 (2), p.25302-025302
Main Authors: Zienkiewicz, T, Bara ski, J, Górski, G, Doma ski, T
Format: Article
Language:English
Subjects:
Andreev states
Majorana quasiparticle
quantum dots
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Summary:We study quasiparticle spectrum of the correlated quantum dot (QD) deposited on superconducting (SC) substrate which is side-coupled to the Rashba nanochain, hosting Majorana end modes. Ground state of an isolated QD proximitized to SC reservoirs is represented either by the singly occupied site or BCS-type superposition of the empty and doubly occupied configurations. Quantum phase transition between these distinct ground states is spectroscopically manifested by the in-gap Andreev states which cross each other at the Fermi level. This qualitatively affects leakage of the Majorana mode from the side-attached nanowire. We inspect the spin-selective relationship between the trivial Andreev states and the leaking Majorana mode, considering (i) perfectly polarized case, when tunneling of one spin component is completely prohibited, and (ii) another one when both spins are hybridized with the nanowire but with different couplings.
ISSN:0953-8984
1361-648X
DOI:10.1088/1361-648X/ab46d9