2015/10/26 by C. Q. Han, H. Li, W. J. Chen +10 · 62 citations
Materials Science · Physics and Astronomy · #Chemical and Physical Properties of Materials #Electronic structure #Fermi energy #Fermi level #Photoemission spectroscopy #Scanning tunneling microscope #Scanning tunneling spectroscopy #Superconductivity #Surface and Thin Film Phenomena #Surface states #Topological Materials and Phenomena #Topological insulator #cond-mat.supr-con
paper · pdf · doi:10.1063/1.4934590
published in Applied Physics Letters 107(17) (American Institute of Physics)
openalex publication_date 2015/10/26 · arxiv created 2015/10/28 · arxiv updated 2015/10/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Using high-resolution angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy, the atomic and low energy electronic structure of the Sr-doped superconducting topological insulators (SrxBi2Se3) was studied. Scanning tunneling microscopy shows that most of the Sr atoms are not in the van der Waals gap. After Sr doping, the Fermi level was found to move further upwards when compared with the parent compound Bi2Se3, which is consistent with the low carrier density in this system. The topological surface state was clearly observed, and the position of the Dirac point was determined in all doped samples. The surface state is well separated from the bulk conduction bands in the momentum space. The persistence of separated topological surface state combined with small Fermi energy makes this superconducting material a very promising candidate for the time reversal invariant topological superconductor.