Electronic structure of a superconducting topological insulator Sr-doped Bi2Se3

Abstract

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

References in corpus (8)

• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Classification of topological insulators and superconductors in three spatial dimensions
• Pressure induced Superconductivity in Topological Compound Bi2Te3
• Bulk superconducting phase with a full energy gap in the doped topological insulator Cu_xBi_2Se_3
• Superconductivity with topological surface state in SrxBi2Se3
• Local Measurements of the Superconducting Pairing Symmetry in CuxBi2Se3
• Majorana Fermions in Nodal Superconductors: Gapless Topological Phase

Cited by in corpus (29)

• Superconducting Topological Surface States in Non-centrosymmetric Bulk Superconductor PbTaSe2
• A comprehensive review on topological superconducting materials and interfaces
• Superconductivity with two-fold symmetry in topological superconductor SrxBi2Se3
• Drive the Dirac Electrons into Cooper Pairs in SrxBi2Se3
• Pressure induced re-emergence of superconductivity in superconducting topological insulator Sr0.065Bi2Se3
• Generalized Anderson's theorem for superconductors derived from topological insulators
• Quasi-particle evidence for the nematic state above $T_{\mathrm{c}}$ in Sr${}_x$Bi${}_2$Se${}_3$
• Induced spectral gap and pairing correlations from superconducting proximity effect
• Dirac lines and loop at the Fermi level in the Time-Reversal Symmetry Breaking Superconductor LaNiGa${}_2$
• A combined method for synthesis of superconducting Cu doped Bi2Se3
• Evidence for singular-phonon-induced nematic superconductivity in a topological superconductor candidate Sr${}_{0.1}$Bi${}_2$Se${}_3$
• Direct Evidence for Time-Reversal Symmetry Breaking in Topological Superconductor Sr0.1Bi2Se3
• Electronic structure and relaxation dynamics in a superconducting topological material
• Tip-induced Superconductivity Coexisting with Preserved Topological Properties in Line-nodal Semimetal ZrSiS
• Low-energy excitations and non-BCS superconductivity in Nb${}_x$-Bi${}_2$Se${}_3$
• Muon spin rotation study of the topological superconductor SrxBi2Se3
• Prediction of Nontrivial Band Topology and Superconductivity in Mg${}_2$Pb
• Observation of Gapped Topological Surface States and Isolated Surface Resonances in PdTe${}_2$ Ultrathin Films
• Observability of superconductivity in Sr-doped Bi2Se3 at the surface using scanning tunneling microscope
• Exceptional Dirac states in a non-centrosymmetric superconductor, BiPd
• Evidence for conventional superconductivity in Sr0.1Bi2Se3 from high pressure studies
• Magneto-Transport and High-Resolution Angle-Resolved Photoelectron Spectroscopy Studies of Palladium Doped Bi${}_2$Te${}_3$
• Nuclear magnetic relaxation rates of unconventional superconductivity in doped topological insulators
• Effect of gallium doping on structural and transport properties of the topological insulator Bi2Se3 grown by molecular beam epitaxy
• Electronic Transport Studies of Ag-doped Bi2Se3 Topological Insulator
• Introduction of Sr into Bi2Se3 thin films by molecular beam epitaxy
• Odd-frequency pairs and anomalous proximity effect in nematic and chiral states of superconducting topological insulators
• Excited-state dynamics of structurally characterized crystal of SnxSb1-x
• Possible two-component pairings in electron-doped Bi${}_2$Se${}_3$ based on a tight-binding model