Atomic and Electronic Structure of the Clean and Adsorbate Covered (0001) Surface of the Topological Insulator Bi2Se3. Issue 11 (16th May 2018)

• Record Type: Journal Article
• Authors: Meyerheim, Holger L.; Tusche, Christian
• Other Names: Balatsky Alexander V. guestEditor.; Brena Barbara guestEditor.; Herper Heike C. guestEditor.; Sanyal Biplab guestEditor.
• Is Part Of: Physica status solidi. Volume 12:Issue 11(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-05-16
• Subjects: angular resolved photoemission -- momentum microscopy -- spin resolved photoemission -- surface X‐ray diffraction -- topological insulators; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.201800078
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : We review recent progress in the characterization of the atomic and electronic structure of pristine and adsorbate‐covered Bi2 Se3 (0001) using state‐of‐the‐art analysis tools like surface X‐ray diffraction, X‐ray absorption fine structure, and spin‐ and momentum‐resolved photoemission spectroscopy. On the basis of several examples we show how the topological surface state is modified by structural modifications. One example is the shift of the Dirac point of the pristine Bi2 Se3 (0001) surface induced by trace amounts of carbon and its concomitant expansion of the topmost inter‐layer spacing. Dosing with atomic hydrogen leads to the complete removal of selenium within the top quintuple layer leaving behind a bismuth bilayer on selenium‐terminated Bi2 Se3 (0001) thereby leading to the appearance of hole‐like Rashba‐split surface states. Gold deposited by molecular beam epitaxy substitutes bismuth within the near surface region involving an opening of a gap in the topological surface state. Abstract : Schematic view is shown of a spin‐resolved photoemission experiment to study the electronic structure of the Bi2 Se3 (0001) surface. Linearly polarized light illuminates the surface with topmost atoms selenium (red) and bismuth (gray). The Dirac cone exhibits the pronounced chirality related to the spin‐momentum locking, which is decisive for the topological protection of the surface state. The analysis of the atomic and electronic structure of pristine and adsorbate‐covered Bi2 Se3 is the theme in this review.