Coexistence of bulk-nodal and surface-nodeless Cooper pairings in a superconducting Dirac semimetal

Abstract

The interplay of nontrivial topology and superconductivity in condensed matter physics gives rise to exotic phenomena. However, materials are extremely rare where it is possible to explore the full details of the superconducting pairing. Here, we investigate the momentum dependence of the superconducting gap distribution in a novel Dirac material PdTe. Using high resolution, low temperature photoemission spectroscopy, we establish it as a spin-orbit coupled Dirac semimetal with the topological Fermi arc crossing the Fermi level on the (010) surface. This spin-textured surface state exhibits a fully gapped superconducting Cooper pairing structure below Tc~4.5K. Moreover, we find a node in the bulk near the Brillouin zone boundary, away from the topological Fermi arc.These observations not only demonstrate the band resolved electronic correlation between topological Fermi arc states and the way it induces Cooper pairing in PdTe, but also provide a rare case where surface and bulk states host a coexistence of nodeless and nodal gap structures enforced by spin-orbit coupling.

arXiv commentaccepted by PRL

References in corpus (32)

• Topological insulators and superconductors
• Non-Abelian Anyons and Topological Quantum Computation
• Maximally-localized generalized Wannier functions for composite energy bands
• Unpaired Majorana fermions in quantum wires
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• A generic new platform for topological quantum computation using semiconductor heterostructures
• Non-abelian statistics of half-quantum vortices in p-wave superconductors
• Majorana Zero Modes and Topological Quantum Computation
• Superconductivity in CuxBi2Se3 and its implications for pairing in the undoped topological insulator
• Observation of topological superconductivity on the surface of an iron-based superconductor
• Topological Superconductivity in CuxBi2Se3
• The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films
• Observation of topological order in a Superconducting doped topological insulator (based on the Bi2Se3 class)
• Majorana Fermions in Proximity-coupled Topological Insulator Nanowires
• Multiple topological states in iron-based superconductors
• Observation of superconductivity in 3D Dirac semimetal Cd3As2 crystal
• Observation of a Robust Zero-energy Bound State in Iron-based Superconductor Fe(Te,Se)
• Momentum dependence of the superconducting gap in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides
• Unconventional Superconductivity at Mesoscopic Point-contacts on the 3-Dimensional Dirac Semi-metal Cd${}_3$As${}_2$
• Coexistence of Intrinsic Superconductivity and Topological Insulator State in Monoclinic Phase WS2
• Observation of Topological Superconductivity in a Stoichiometric Transition Metal Dichalcogenide 2M-WS2
• Fermiology and Superconductivity of Topological Surface States in PdTe${}_2$
• Topological nodal Cooper pairing in doped Weyl metals
• Type I superconductivity in the Dirac semimetal PdTe2
• Conventional Superconductivity in Type II Dirac Semimetal PdTe${}_2$
• Superconductivity in doped Dirac semimetals
• Berry phase in Magnetic Superconductors
• Superconductivity and Fermi Surface Nesting in the Candidate Dirac Semimetal NbC
• Nodal higher-order topological superconductivity from a ${\mathcal{C}}_4$-symmetric Dirac semimetal
• Surface Bogoliubov-Dirac cones and helical Majorana hinge modes in superconducting Dirac semimetals
• Observation of the topological Dirac fermions and surface states in superconducting BaSn3

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• Atomic Visualization of Bulk and Surface Superconductivity in Weyl Semimetal γ-PtBi2
• A topological Hund nodal line antiferromagnet
• Cubic Dirac Semimetals: General Theory and Application to Rare-Earth Magnets
• Majorana Flat Bands in the Vortex Line of Superconducting Weyl Semimetals
• Superconducting PdTe Thin Film Via Topotactic Transformation, Toward Topological Superconductors
• Exploring unconventional superconductivity in PdTe via Point Contact Spectroscopy
• Multigap nodeless superconductivity in Dirac semimetal PdTe