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Twisting the stacking of layered materials leads to rich new physics. A threedimensional (3D) topological insulator film host two dimensional gapless Diracelectrons on top and bottom surfaces, which, when the film is below somecritical thickness, will hybridize and open a gap in the surface statestructure. The hybridization gap can be tuned by various parameters such asfilm thickness, inversion symmetry, etc. according to the literature. The 3Dstrong topological insulator Bi(Sb)Se(Te) family have layered structurescomposed of quintuple layers (QL) stacked together by van der Waalsinteraction. Here we successfully grow twistedly-stacked Sb2Te3 QLs andinvestigate the effect of twist angels on the hybridization gaps below thethickness limit. We find that the hybridization gap can be tuned for films ofthree QLs, which might lead to quantum spin Hall states. Signatures ofgap-closing are found in 3-QL films. The successful in-situ application of thisapproach opening a new route to search for exotic physics in topologicalinsulators.

Modification of the hybridization gap by twisted stacking of quintuple layers in a three dimensional topological insulator thin film