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Topological surface-states can acquire an energy gap when time-reversalsymmetry is broken by interfacing with a magnetic insulator. This gap has yetto be measured. Such topological-magnetic insulator heterostructures can host aquantized anomalous Hall effect and can allow the control of the magnetic stateof the insulator in a spintronic device. In this work, we observe the energygap of topological surface-states in proximity to a magnetic insulator usingmagnetooptical Landau level spectroscopy. We measure Pb1-xSnxSe/EuSeheterostructures grown by molecular beam epitaxy exhibiting a record mobilityand low Fermi energy. Through temperature dependent measurements andtheoretical calculations, we show this gap is likely due to quantum confinementand conclude that the magnetic proximity effect is weak in this system. Thisweakness is disadvantageous for the realization of the quantum anomalous Halleffect, but favorable for spintronic devices which require the preservation ofspin-momentum locking at the Fermi level.

Energy gap of topological surface states in proximity to a magnetic insulator