A high-temperature quantum anomalous Hall effect in electride gadolinium monohalides

Abstract

Electrides, with interstitial electrons loosely trapped in lattice voids behaving as anions, are favorable for achieving band inversions required for topological phases. In this paper, we predict that the quantum...

Ferromagnetic GdX (X = Cl, Br) Monolayers with Large Perpendicular Magnetic Anisotropy and High Curie Temperature

“…The contribution of Cl and Br atoms to the total magnetic moment is very small and negligible. Our calculated in-plane lattice constants of FM monolayers GdCl and GdBr are 3.70 and 3.78 Å, respectively, agreeing well with the previous result …”

“…Our calculated in-plane lattice constants of FM monolayers GdCl and GdBr are 3.70 and 3.78 Å, respectively, agreeing well with the previous result. 35 As shown in Figure S3a,c, there are no imaginary phonon modes in the whole Brillouin zone of FM monolayers GdCl and GdBr except for the negligible imaginary frequencies around the Γ-point. Due to the lattice instability of the long-wave undulations, 45 the imaginary phonon modes at the Γ-point were reported in other 2D materials which are dynamically stable.…”

“…The 2D layered materials, GdX (X = Cl and Br), have been experimentally prepared. , Few-layer structures of GdX have been predicted to be FM with high T C and topological effects. , Inspired by this and the promising potential of Gd elements, we investigated the stability, electronic structures, and magnetic properties of GdX (X = Cl and Br) monolayers by performing the density functional theory (DFT) type of first principles calculations. Our calculations predicted the large PMA and ultrahigh T C for GdCl and GdBr monolayers.…”

Effects of pressure and temperature on topological electronic materials X2Y3 (X = As, Sb, Bi; Y = Se, Te) using first-principles

“…These cones give rise to appealing physical properties, e.g., high carrier mobility 16 and quantum anomalous Hall effect. [17][18][19][20] Formally, topological insulators are typically characterized by an odd value of the Z 2 topological invariant. 1,2,21,22 Previous work has shown that the time-reversal invariant band in three dimensions is characterized by four Z 2 invariants, resulting in 16 types of topological insulators.…”