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

DOI: 10.1073/pnas.2116575119 DOI Help

Authors: Gian Marco Pierantozzi (Istituto Officina dei Materiali (IOM)-CNR) , Alessandro De Vita (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche; University of Milano) , Chiara Bigi (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche) , Xin Gui (Princeton University) , Hung-Ju Tien (National Cheng Kung University) , Debashis Mondal (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche; International Centre for Theoretical Physics) , Federico Mazzola (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche) , Jun Fujii (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche) , Ivana Vobornik (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche) , Giovanni Vinai (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche) , Alessandro Sala (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche) , Cristina Africh (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche) , Tien-Lin Lee (Diamond Light Source) , Giorgio Rossi (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche; University of Milano) , Tay-Rong Chang (National Cheng Kung University; Center for Quantum Frontiers of Research and Technology; National Taiwan University) , Weiwei Xie (Rutgers University) , Robert J. Cava (Princeton University) , Giancarlo Panaccione (Istituto Officina dei Materiali, Consiglio Nazionale delle Ricerche)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Proceedings Of The National Academy Of Sciences , VOL 119

State: Published (Approved)
Published: January 2022
Diamond Proposal Number(s): 24968

Open Access Open Access

Abstract: 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 first-principle calculations. We reveal the presence of in-plane long-range 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.

Journal Keywords: axion insulator; magnetism; spin polarization; ARPES; topological surface states

Diamond Keywords: Ferromagnetism; Spintronics

Subject Areas: Materials, Physics


Instruments: I09-Surface and Interface Structural Analysis

Other Facilities: APE-LE at Elettra

Added On: 24/01/2022 11:40

Documents:
e2116575119.full.pdf

Discipline Tags:

Surfaces Quantum Materials Hard condensed matter - electronic properties Physics Electronics Magnetism Materials Science

Technical Tags:

Spectroscopy Circular Dichroism (CD) X-ray Absorption Spectroscopy (XAS) X-ray Magnetic Circular Dichroism (XMCD)