Superconducting Topological Surface States in Non-centrosymmetric Bulk Superconductor PbTaSe2

Abstract

The search for topological superconductors (TSCs) is one of the most urgent contemporary problems in condensed matter systems. TSCs are characterized by a full superconducting gap in the bulk and topologically protected gapless surface (or edge) states. Within each vortex core of TSCs, there exist the zero energy Majorana bound states, which are predicted to exhibit non-Abelian statistics and to form the basis of the fault-tolerant quantum computation. So far, no stoichiometric bulk material exhibits the required topological surface states (TSSs) at Fermi level combined with fully gapped bulk superconductivity. Here, we report atomic scale visualization of the TSSs of the non-centrosymmetric fully-gapped superconductor, PbTaSe2. Using quasiparticle scattering interference (QPI) imaging, we find two TSSs with a Dirac point at E~1.0eV, of which the inner TSS and partial outer TSS cross Fermi level, on the Pb-terminated surface of this fully gapped superconductor. This discovery reveals PbTaSe2 as a promising candidate as a TSC.

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• Transmission of topological surface states through surface barriers
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• Dirac Surface States and Nature of Superconductivity in Noncentrosymmetric BiPd
• Experimental Observation of Topological Superconductivity and Majorana Zero Modes on beta-Bi2Pd Thin Films
• Surface spectral function in the superconducting state of a topological insulator
• Signatures of Dirac fermion-mediated magnetic order
• Quasi-particle interferences of the Weyl semimetals TaAs and NbP
• Observation of the spin-polarized surface state in a noncentrosymmetric superconductor BiPd
• Drive the Dirac Electrons into Cooper Pairs in SrxBi2Se3
• Imaging two-component nature of Dirac-Landau levels in the topological surface state of Bi2Se3
• Nodeless superconductivity in noncentrosymmetric PbTaSe${}_2$ single crystals
• Single gap superconductivity in beta-Bi2Pd
• Multiple nodeless superconducting gaps in noncentrosymmetric superconductor PbTaSe2 with topological bulk nodal lines
• Induced spectral gap and pairing correlations from superconducting proximity effect
• Single crystal growth and physical property characterization of PbTaSe2 as a noncentrosymmetric type-II superconductor
• Discovery of the topological surface state in a noncentrosymmetric superconductor BiPd

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