Evidence for one-dimensional chiral edge states in a magnetic Weyl semimetal Co3Sn2S2

Sean Howard, Lin Jiao, Zhenyu Wang, Noam Morali, Rajib Batabyal, Pranab Kumar-Nag, Nurit Avraham, Haim Beidenkopf, Praveen Vir, Enke Liu, Chandra Shekhar, Claudia Felser, Taylor Hughes, Vidya Madhavan

Research output: Contribution to journalArticlepeer-review

Abstract

The physical realization of Chern insulators is of fundamental and practical interest, as they are predicted to host the quantum anomalous Hall (QAH) effect and topologically protected chiral edge states which can carry dissipationless current. Current realizations of the QAH state often require complex heterostructures and sub-Kelvin temperatures, making the discovery of intrinsic, high temperature QAH systems of significant interest. In this work we show that time-reversal symmetry breaking Weyl semimetals, being essentially stacks of Chern insulators with inter-layer coupling, may provide a new platform for the higher temperature realization of robust chiral edge states. We present combined scanning tunneling spectroscopy and theoretical investigations of the magnetic Weyl semimetal, Co3Sn2S2. Using modeling and numerical simulations we find that depending on the strength of the interlayer coupling, chiral edge states can be localized on partially exposed kagome planes on the surfaces of a Weyl semimetal. Correspondingly, our dI/dV maps on the kagome Co3Sn terraces show topological states confined to the edges which display linear dispersion. This work provides a new paradigm for realizing chiral edge modes and provides a pathway for the realization of higher temperature QAH effect in magnetic Weyl systems in the two-dimensional limit.

Original languageEnglish (US)
Article number4269
JournalNature communications
Volume12
Issue number1
DOIs
StatePublished - Dec 1 2021

ASJC Scopus subject areas

  • General
  • General Physics and Astronomy
  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology

Fingerprint

Dive into the research topics of 'Evidence for one-dimensional chiral edge states in a magnetic Weyl semimetal Co3Sn2S2'. Together they form a unique fingerprint.

Cite this