A 90 Atomic structure of Bi2Se3 and Bi2Te3 (111) surfaces probed by photoelectron / M. V. Kuznetsov [et al.] // Physical Review B: Condensed Matter and Materials Physics . - 2015. - Vol. 91, № 8. - P085402-1-085402-7. - Bibliogr. : p. 085402-7( 34 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): ДИФРАКЦИЯ -- ГОЛОГРАФИЯ Аннотация: Understanding how topologically protected surface states behave at surfaces and interfaces requires knowledgeof the atomic structure. Whether the (111) surfaces of the prototypical topological insulators Bi2Se3 and Bi2Te3are Bi or chalcogen terminated is the subject of current controversies. We employ photoelectron diffraction and holography, combining the advantages and avoiding the disadvantages of the contesting techniques previously used. We find bulklike chalcogen termination with a very small surface relaxation (<1%) in agreement with density functional theory simulations. We prove the chalcogen termination for cleaved crystals and pitaxial films which shows the robustness of our conclusions |