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Bismuth Selenide is a two-dimensional topological insulator material composedof stacked quintuple layers (QL). The layers are held together by a weak vander Waals force that enables surface preparation by cleaving. Low energy ionscattering experiments (LEIS) show that Bi2Se3 cleaved under ultra-high vacuum(UHV) has a Se-terminated structure that is consistent with cleaving betweenQLs. Comparison of experimental data to molecular dynamics simulations confirmsthe Se-termination and provides an estimate of the surface relaxation.

Surface Structure of In Situ Cleaved Single Crystal Bi2Se3 Measured by Low Energy Ion Scattering