![]() ![]() Last but not least the calculated Fermi velocities of Dirac fermions of about 4 × 10 5 m s −1 indicate very high mobility in NiCl 3 monolayers. ![]() The calculated large non-trivial gap, high Curie temperature and single-spin Dirac states reported herein for the NiCl 3 monolayer led us to propose that this material gives a great promise for potential realization of a near-room temperature QAH effect and potential applications in spintronics. Taking into account the spin–orbit coupling, the NiCl 3 monolayer becomes an intrinsic Chern insulator with a large non-trivial band gap of ∼24 meV, corresponding to an operating temperature as high as ∼280 K at which the quantum anomalous Hall effect could be observed. Thus, the NiCl 3 monolayer represents a new class of Dirac materials with Dirac spin-gapless semiconducting properties and high-temperature ferromagnetism (∼400 K). ![]() Based on first-principles calculations it is shown here that a nickel chloride (NiCl 3) monolayer has all these characteristics. A great obstacle for practical applications of the quantum anomalous Hall (QAH) effect is the lack of suitable QAH materials (Chern insulators) with a large non-trivial band gap, room-temperature magnetic order and high carrier mobility.
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