| Full text | |
| Author(s): |
Sanches, J. E.
;
Lustosa, L. T.
;
Ricco, L. S.
;
Sigurosson, H.
;
de Souza, M.
;
Figueira, M. S.
;
Marinho Jr, E.
;
Seridonio, A. C.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | JOURNAL OF PHYSICS-CONDENSED MATTER; v. 37, n. 20, p. 8-pg., 2025-05-19. |
| Abstract | |
The 'poor man's Majoranas' (PMMs) (Leijnse and Flensberg 2012 Phys. Rev. B 86 134528) devoid of topological protection can 'spill over' from one edge into another of the minimal Kitaev chain when perturbed electrostatically. As aftermath, this leads to a delocalized Majorana fermion (MF) at both the edges. Additionally, according to recent differential conductance measurements in a pair of superconducting and spinless quantum dots (QDs), such a PMM picture was brought to reality (Dvir et al 2023 Nature 614 445; ten Haaf et al 2024 Nature 630 329). Based on this scenario, we propose the spillover of the PMM when its QD is exchange coupled to a quantum spin S. We show that if this QD is perturbed by the exchange coupling J, solely the half 2S+1 (2S+2) of the fine structure stays explicit for a fermionic (bosonic) S. Concurrently, the other half squeezes itself as the delocalized MF zero-mode. Particularly, turning-off the superconductivity the multiplicity 2S+1 holds regardless the spin statistics. Meanwhile, the PMM spillover induced by J becomes a statistics dependent effect. Hence, our findings contribute to the comprehension of spin-phenomena interplay with superconductivity in minimal Kitaev chains, offering insights for future quantum computing devices hosting PMMs. (AU) | |
| FAPESP's process: | 23/13467-6 - Proposal of pinned Majorana bound states in topological and correlated multi Dirac-Weyl materials with broken inversion symmetry |
| Grantee: | Antonio Carlos Ferreira Seridonio |
| Support Opportunities: | Regular Research Grants |