Evidence of magnetism-induced topological protection in the axion insulator candidate EuSn2P2

Gian Marco Pierantozzi, Alessandro De Vita, Chiara Bigi, Xin Gui, Hung Ju Tien, Debashis Mondal, Federico Mazzola, Jun Fujii, Ivana Vobornik, Giovanni Vinai, Alessandro Sala, Cristina Africh, Tien Lin Lee, Giorgio Rossi, Tay Rong Chang, Weiwei Xie, Robert J. Cava, Giancarlo Panaccione

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We unravel the interplay of topological properties and the layered (anti)ferromagnetic ordering in EuSn2P2, using spin and chemical selective electron and X-ray spectroscopies supported by firstprinciple calculations. We reveal the presence of in-plane longrange ferromagnetic order triggering topological invariants and resulting in the multiple protection of topological Dirac states. We provide clear evidence that layer-dependent spin-momentum locking coexists with ferromagnetism in this material, a cohabitation that promotes EuSn2P2 as a prime candidate axion insulator for topological antiferromagnetic spintronics applications.

Original languageEnglish (US)
Article numbere2116575119
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number4
StatePublished - Jan 25 2022

All Science Journal Classification (ASJC) codes

  • General


  • Axion insulator
  • Magnetism
  • Spin polarization
  • Topological surface states


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