Fractionalization of Majorana-Ising-type quasiparticles
Abstract
We theoretically investigate the spectral properties of a quantum impurity (QI) hosting the here proposed {Majorana-Ising-type quasiparticle (MIQ) excitation}. It arises from the coupling between a finite topological superconductor (TSC) based on a chain of magnetic adatoms-superconducting hybrid system and an integer large spin flanking the QI. Noteworthy, the spin couples to the QI via the Ising-type exchange interaction. As the Majorana zero-modes (MZMs) at the edges of the TSC chain are overlapped, we counterintuitively find a regime wherein the Ising term modulates the localization of a fractionalized and resonant MZM at the QI site. Interestingly enough, the fermionic nature of this state is revealed as purely of electron tunneling-type and most astonishingly, it has the Andreev conductance completely null in its birth. Therefore, we find that a resonant edge state appears as a zero-mode and discuss it in terms of a poor man's Majorana[Nature 614, 445 (2023)].
Keywords
Cite
@article{arxiv.2301.03507,
title = {Fractionalization of Majorana-Ising-type quasiparticles},
author = {J. E. Sanches and L. T. Lustosa and L. S. Ricco and I. A. Shelykh and M. de Souza and M. S. Figueira and A. C. Seridonio},
journal= {arXiv preprint arXiv:2301.03507},
year = {2023}
}