Suppressing Majorana Hybridization in Atomically Assembled Cr Chains on Bi2Pd

Abstract

Magnetic-atom chains on superconductors can host Majorana zero modes, but in finite chains the two end modes generally hibridize and split away from zero energy. We show that Cr chains assembled atom-by-atom on the Bi-terminated surface of Bi2Pd enter a short-localization-length Shiba chain regime wthat strongly suppreesses this finite-size hybridization. Scanning tunneling spectroscopy reveals a chaing-leght-driven closing and reopening of the in-gap spectrum, followed by zero-bias modes localized at the chains ends. Green-function calculations reproduce the evolution and show an exchange of electorn-holec haracter across the transition. From the residual splitting we extract a localization length of about three atomic sites, explaining the stability of the zero-energy modes in experimentally accessible chains.

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BibTeX RIS

BibTeX

@misc{kim2026suppressing,
  title = {{Suppressing Majorana Hybridization in Atomically Assembled Cr Chains on Bi2Pd}},
  author = {Jinkyung Kim and Piotr Kot and Ryo Ogawa and Atustaka Maeda and Andreas J. Heinrich and Nicolas Lorente and Deung-Jang Choi},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.29446},
  eprint = {2610.29446},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.29446},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Suppressing Majorana Hybridization in Atomically Assembled Cr Chains on Bi2Pd
AU  - Jinkyung Kim
AU  - Piotr Kot
AU  - Ryo Ogawa
AU  - Atustaka Maeda
AU  - Andreas J. Heinrich
AU  - Nicolas Lorente
AU  - Deung-Jang Choi
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2610.29446
UR  - https://arxiv.org/abs/2610.29446
AB  - Magnetic-atom chains on superconductors can host Majorana zero modes, but in finite chains the two end modes generally hibridize and split away from zero energy. We show that Cr chains assembled atom-by-atom on the Bi-terminated surface of Bi2Pd enter a short-localization-length Shiba chain regime wthat strongly suppreesses this finite-size hybridization. Scanning tunneling spectroscopy reveals a chaing-leght-driven closing and reopening of the in-gap spectrum, followed by zero-bias modes localized at the chains ends. Green-function calculations reproduce the evolution and show an exchange of electorn-holec haracter across the transition. From the residual splitting we extract a localization length of about three atomic sites, explaining the stability of the zero-energy modes in experimentally accessible chains.
ER  -

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