We propose and theoretically demonstrate a platform for realizing both the axion insulator and quantum anomalous Hall (QAH) phases. This platform is a ${\mathrm{Bi}}_2{\mathrm{Se}}_3$-based topological insulator film that is confined between two out-of-plane magnetized films of ${\mathrm{MnBi}}_2{\mathrm{Se}}_4$ and ${\mathrm{CrBi}}_2{\mathrm{Se}}_4$. Our first-principles calculations show that this design induces substantial splitting of the topological surface states which facilitates the realization of axion and QAH phases at elevated temperatures. This work establishes a tunable material platform for probing the interplay between distinct topological magnetic phases and for exploiting their exotic properties in next-generation devices.

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• Electronic structure
• Magnetoelectric effect
• Quantum anomalous Hall effect
• Surfaces
• Topological materials