Correlation-driven topological and valley states in monolayer VSi2P4

Room-temperature spin valve effect in the TiCr2N4 monolayer

“…24 The magnetic properties of the VSi 2 N 4 monolayer can be effectively modulated by applying tensile biaxial strain or electron doping. The valley property, 25,26 topological feature, 27 and intrinsic piezoelectricity 28 were predicted for VSi 2 N 4 or VSi 2 P 4 monolayers. A bias-dependent spin filtering effect and the temperature-driven spin Seebeck effect were found in the VSi 2 X 4 (X = N, P, and As) monolayers, 22 which show potential applications in spintronics and thermoelectricity.…”

Correlation-enhanced spin–orbit coupling in a quantum anomalous Hall insulator Fe2Br2 monolayer with a large band gap and robust ferromagnetism

“…In the presence of the electron correlation, the SOC effect of 3d systems with special orbital symmetry and electron occupation is found to be more prominent. 26–29 Here, we optimize the lattice constants a with varied U (0–4 eV), and then determine the magnetic ground state. The energy differences between antiferromagnetic (AFM) and FM ordering vs U are plotted in Fig.…”

Tuning the magnetic anisotropy and topological phase with electronic correlation in single-layer H-FeBr$_2$

“…Therefore, it is easier to tune the electronic correlation strength of 2D systems experimentally, e.g., through the use of structured substrate [12][13][14] or the growth of multilayer films with different thicknesses [15]. On the other hand, the properties developed by Coulomb engineering have been theoretically revelled in 2D materials [10,11,16,17]. For example, a coexisting quantum anomalous Hall insulation state in the VSi 2 P 4 monolayer has been proposed with tuning of the Hubbard U -constant in first-principles calculations [17]; By varying the Coulomb repulsion U, the location of the metal-insulator transition and the magnetism as well as the superconductivity of some 2D systems were revealed [10].…”

“…On the other hand, the properties developed by Coulomb engineering have been theoretically revelled in 2D materials [10,11,16,17]. For example, a coexisting quantum anomalous Hall insulation state in the VSi 2 P 4 monolayer has been proposed with tuning of the Hubbard U -constant in first-principles calculations [17]; By varying the Coulomb repulsion U, the location of the metal-insulator transition and the magnetism as well as the superconductivity of some 2D systems were revealed [10]. Thus, 2D materials provide a good playground to investigate numerous electronic correlation effects.…”

“…This, of course, drives the evolution of the atomic-scale magnetic anisotropy (MA) of the system. As we know, the atomic-scale MA is not only tightly related to the performance of the upper limit of the system's magnetic memory, but also in connection with the polarization of valleys in FV materials due to the magneto-valley coupling [17,23]. So, it is necessary to study the MA of SL H-FeX 2 (X=Cl, Br, I).…”