High-temperature quantum anomalous Hall regime in a MnBi2Te4/Bi2Te3 superlattice

Mn‐Rich MnSb2Te4: A Topological Insulator with Magnetic Gap Closing at High Curie Temperatures of 45–50 K

“…[ 2–5 ] This gap hosts chiral edge states with precisely quantized conductivity. However, the experimental temperatures featuring the QAHE are between 30 mK [ 7,13 ] and a few K [ 18,19 ] only, significantly lower than the ferromagnetic transition temperatures T C in these systems. [ 20 ] If the temperature of the QAHE could be raised, applications such as chiral interconnects, [ 21 ] edge state spintronics, [ 22,23 ] and metrological standards [ 14,15 ] become realistic.…”

Evolution of Berry curvature and reentrant quantum anomalous Hall effect in an intrinsic magnetic topological insulator

“…Here g(T ) ∝ exp[−(T M /T ) 1/3 ] [ 60,61] where T M = (Bλ 2 ρ) −1 with density of states ρ, the localization length λ, the constant B and the temperature T . Thus, the onset temperature of the QAH can be much lower than the inverted gap, since T M that is usually only a few Kelvin [27,29,62,63] is much smaller than the energy gap. To enhance the QAH onset temperature, it is desirable to reduce the density of impurity states ρ and decrease the localization length λ of impurity states.…”

“…MnBi 2 Te 4 exhibits antiferromagnetic (AFM) order and supports an axion insulator state without an external magnetic field. Applying the magnetic field to drive a transition from an AFM order to a ferromagnetic (FM) order can result in a quantum phase transition from an axion insulator to a QAH state in the even-number septuple-layered MnBi 2 Te 4 [26][27][28][29]. Meanwhile, the QAH state was also observed in the odd-number septuple-layered 127211-2 MnBi 2 Te 4 , but the quantization of Hall resistance strongly depends on disorder and external magnetic fields [27].…”

Two-dimensional magnetic atomic crystals

“…Different from the above antiferromagnetic 2D crystal, intrinsic magnetic topological insulators (MnBi 2 Te 4 )(Bi 2 Te 3 ) n are quite particular. 135,148,149 The magnetosphere of such magnetic crystal is separated by a great deal of nonmagnetospheres, meanwhile, the magnetosphere (SL) with magnetic independence MnBi 2 Te 4 is separated by the n-layer of a non-magnetosphere quaternion (QL) of Bi 2 Te 3 , showing the flexible magnetic and topological states (Fig. 10).…”