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.

accepted by PRL

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Cited by in corpus (10)

• Evidence for Unconventional Superconductivity and Nontrivial Topology in PdTe
• Intrinsic superconducting diode effects in tilted Weyl and Dirac semimetals
• Signature of point nodal superconductivity in the Dirac semimetal PdTe
• 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