Unprotected quadratic band crossing points and quantum anomalous Hall effect in FeB2 monolayer

Evidence for Two-Dimensional Weyl Fermions in Air-Stable Monolayer PtTe1.75

“…The spin-split bands are inverted, forming a 2-fold degenerate critical Weyl point in the M 100 *T invariant line Γ-K, as indicated by the red arrow in Figure c. The symmetry protection by [TM 100 ] 2 = 1 is different from the conventional 2D Weyl point protected by PT in spinless systems , and TC 2 z system in spinful systems. , The critical Weyl point emerges as the SOC strength approaches a critical value.…”

“…The symmetry protection by [TM 100 ] 2 = 1 34 is different from the conventional 2D Weyl point protected by PT in spinless systems 35,36 and TC 2z system in spinful systems. 37,38 The critical Weyl point emerges as the SOC strength approaches a critical value.…”

Novel Piezoelectricity in Two-Dimensional Metallic/Semimetallic Materials with Out-of-Plane Polarization

“…It is a nonmagnetic system and has a high intrinsic carrier mobility of 0.58 × 10 5 cm 2 V –1 s –1 which is less affected by charge doping . Recently, quantum anomalous Hall effect associated with Chern number has been predicted in FeB 2 monolayer …”

“…50 Recently, quantum anomalous Hall effect associated with Chern number has been predicted in FeB 2 monolayer. 55 The optimized geometry structure of the FeB 2 monolayer is depicted in Figure 2a. B atoms form a graphene-like honeycomb grid with a lattice constant of 3.178 Å, while Fe atoms are located at a vertical distance of h = 0.63 Å above the hexagonal center.…”