Generic Approach to Intrinsic Magnetic Second-Order Topological Insulators via Inverted p-d Orbitals

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Abstract

The integration of intrinsically magnetic and topologically nontrivial two-dimensional materials holds tantalizing prospects for exotic quantum anomalous Hall insulators and magnetic second-order topological insulators (SOTIs). Compared with their well-studied nonmagnetic counterparts, the pursuit of intrinsic magnetic SOTIs remains limited. In this work, we address this gap by focusing on p-d orbitals inversion, a fundamental but often overlooked phenomena in the construction of topological materials. We begin by developing a theoretical framework to elucidate p-d orbital inversion through a combined density-functional theory calculation and Wannier downfolding. Subsequently we showcase the generality of this concept in realizing ferromagnetism SOTIs by identifying two real materials with distinct lattices: 1T-VS2 monolayer in a hexagonal lattice and CrAs monolayer in a square lattice. We further compare it with other mechanisms requiring spin-orbit coupling and explore the similarities to topological Kondo insulators. Our findings establish a generic pathway toward intrinsic magnetic SOTIs.

Original languageEnglish
Pages (from-to)11295–11301
Number of pages7
JournalNano Letters
Volume24
Issue number36
DOIs
Publication statusPublished - 30 Aug 2024

Keywords

  • ferromagnetic second-order topological insulator
  • hexagonal lattice
  • inverted p−d orbitals
  • square lattice

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