Abstract
We fabricated MnBi2Se4/(n − 1) quintuple layer (QL) Bi2Se3 magnetic topological heterostructures (n = 1–6) and measured the Dirac cone dispersion with angle-resolved photoemission spectroscopy. We observed a clear gap opening for films with n = 2–6 and the gap size decreased as the film thickness increased. From magnetization measurements using SQUID, all the heterostructures showed hysteresis loops at 4 K and at room temperature, confirming that MnBi2Se4 is a room temperature van der Waals ferromagnet. We were able to distinguish the contribution of the hybridization and magnetic effects on the observed Dirac-cone gap directly using a four-band model and its implications on the behavior of the expected quantum anomalous Hall effect is discussed.
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