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Combining magnetism and nontrivial band topology gives rise to quantumanomalous Hall (QAH) insulators and exotic quantum phases such as the QAHeffect where current flows without dissipation along quantized edge states.Inducing magnetic order in topological insulators via proximity to a magneticmaterial offers a promising pathway towards achieving QAH effect at hightemperature for lossless transport applications. One promising architectureinvolves a sandwich structure comprising two single layers of MnBi2Te4 (a 2Dferromagnetic insulator) with ultra-thin Bi2Te3 in the middle, and is predictedto yield a robust QAH insulator phase with a bandgap well above thermal energyat room temperature (25 meV). Here we demonstrate the growth of a 1SL MnBi2Te4/ 4QL Bi2Te3 /1SL MnBi2Te4 heterostructure via molecular beam epitaxy, andprobe the electronic structure using angle resolved photoelectron spectroscopy.We observe strong hexagonally warped massive Dirac Fermions and a bandgap of 75meV. The magnetic origin of the gap is confirmed by the observation of brokentime reversal symmetry and the exchange-Rashba effect, in excellent agreementwith density functional theory calculations. These findings provide insightsinto magnetic proximity effects in topological insulators, that will movelossless transport in topological insulators towards higher temperature.

Large bandgap quantum anomalous hall insulator in a designer ferromagnet-topological insulator-ferromagnet heterostructure