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Unoccupied topological surface state in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>MnBi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>
The unoccupied part of the band structure in the magnetic topological insulator ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$ is studied by first-principles calculations. We propose a possible second, unoccupied topological surface state with a similar electronic structure to the celebrated occupied topological surface state. The conventional density functional theory method employed here may not describe …