Evidence for dispersing 1D Majorana channels in an iron-based superconductor

Zhenyu Wang, Jorge Olivares Rodriguez, Lin Jiao, Sean Howard, Martin Graham, G. D. Gu, Taylor L. Hughes, Dirk K. Morr, Vidya Madhavan

Research output: Contribution to journalArticle

Abstract

The possible realization of Majorana fermions as quasiparticle excitations in condensed-matter physics has created much excitement. Most studies have focused on Majorana bound states; however, propagating Majorana states with linear dispersion have also been predicted. Here, we report scanning tunneling spectroscopic measurements of crystalline domain walls (DWs) in FeSe0.45Te0.55. We located DWs across which the lattice structure shifts by half a unit cell. These DWs have a finite, flat density of states inside the superconducting gap, which is a hallmark of linearly dispersing modes in one dimension. This signature is absent in DWs in the related superconductor, FeSe, which is not in the topological phase. Our combined data are consistent with the observation of dispersing Majorana states at a p-phase shift DW in a proximitized topological material.

Original languageEnglish (US)
Pages (from-to)104-108
Number of pages5
JournalScience
Volume367
Issue number6473
DOIs
StatePublished - Jan 3 2020

ASJC Scopus subject areas

  • General

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    Wang, Z., Rodriguez, J. O., Jiao, L., Howard, S., Graham, M., Gu, G. D., Hughes, T. L., Morr, D. K., & Madhavan, V. (2020). Evidence for dispersing 1D Majorana channels in an iron-based superconductor. Science, 367(6473), 104-108. https://doi.org/10.1126/science.aaw8419