Altermagnets have emerged as a fertile ground for quantum phenomena,but topological phases unifying different quasiparticles remain largely unexplored.Here,we demonstrate that monolayer AgF_(2) hosts a dual topologica...Altermagnets have emerged as a fertile ground for quantum phenomena,but topological phases unifying different quasiparticles remain largely unexplored.Here,we demonstrate that monolayer AgF_(2) hosts a dual topological state,driven by a single ferroelastic distortion.This polar transition breaks inversion symmetry and unleashes relativistic spin-orbit effects,simultaneously imparting non-trivial topology to electrons and magnons.The result is valence bands with opposite Chern numbers,C^(E)=±3,and a magnon spectrum with a full topological gap and chiral bands,C^(M)=±1.This work realizes topological altermagnonics in a tangible material platform,with a clear experimental fingerprint in the transverse thermal Hall effect.The coexistence of fermionic and bosonic topology in AgF_(2) opens new directions for designing intrinsically hybrid quantum matter.展开更多
基金supported by FONDECYT Regular Grants(Nos.1250364 and 1250803)the Basal Program for Centers of Excellence(CEDENNA)(Grant No.CIA250002)support from FONDECYT Initiation(Grant No.11251906)。
文摘Altermagnets have emerged as a fertile ground for quantum phenomena,but topological phases unifying different quasiparticles remain largely unexplored.Here,we demonstrate that monolayer AgF_(2) hosts a dual topological state,driven by a single ferroelastic distortion.This polar transition breaks inversion symmetry and unleashes relativistic spin-orbit effects,simultaneously imparting non-trivial topology to electrons and magnons.The result is valence bands with opposite Chern numbers,C^(E)=±3,and a magnon spectrum with a full topological gap and chiral bands,C^(M)=±1.This work realizes topological altermagnonics in a tangible material platform,with a clear experimental fingerprint in the transverse thermal Hall effect.The coexistence of fermionic and bosonic topology in AgF_(2) opens new directions for designing intrinsically hybrid quantum matter.
