Mechanism for Nodal Topological Superconductivity on PtBi${}_2$ Surface

Abstract

Experiments show that the Weyl semimetal PtBi${}_2$ hosts unconventional superconductivity in its topological surface states. Hence, the material is a candidate for intrinsic topological superconductivity. Measurements indicate nodal gaps in the center of the Fermi arcs. We derive that anisotropic electron-phonon coupling on Weyl semimetal surfaces, combined with statically screened Coulomb repulsion, is a microscopic mechanism for this nodal pairing. The dominant solution of the linearized gap equation shows nodal gaps when the surface state bandwidth is comparable to the maximum phonon energy, as is the case in PtBi${}_2$. We further predict that if the screening of Coulomb interaction on the surface is enhanced by Coulomb engineering, the superconducting gap becomes nodeless, and the critical temperature increases.

9+14 pages, 4+9 figures, accepted in Physical Review Letters

References in corpus (36)

• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Strong electronic correlations from Hund's coupling
• Introduction to topological superconductivity and Majorana fermions
• Two-dimensional altermagnets: Superconductivity in a minimal microscopic model
• First order character and observable signatures of topological quantum phase transitions
• Superconducting Arcs
• Surface superconductivity in the topological Weyl semimetal t-PtBi${}_2$
• Topological Superconductivity Mediated by Skyrmionic Magnons
• Many-body effects on superconductivity mediated by double-magnon processes in altermagnets
• Quantum topological phase transitions in skyrmion crystals
• Spontaneous time-reversal symmetry breaking by disorder in superconductors
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Unconventional superconducting pairing symmetry induced by phonons
• Electronic structure of the surface superconducting Weyl semimetal PtBi${}_2$
• Multiband strong-coupling superconductors with spontaneously broken time-reversal symmetry
• Intrinsic surface superconducting instability in Type-I Weyl Semimetals
• Screening Induced Crossover between Phonon- and Plasmon-Mediated Pairing in Layered Superconductors
• Fermi arcs dominating the electronic surface properties of trigonal PtBi${}_2$
• Bogoliubov Fermi surfaces from pairing of emergent $j=3/2$ fermions on the pyrochlore lattice
• Topological superconductivity mediated by magnons of helical magnetic states
• Phonon-mediated spin-polarized superconductivity in altermagnets
• Stability of superconducting gap symmetries arising from antiferromagnetic magnons
• Phonon-mediated intrinsic topological superconductivity in Fermi arcs
• Exceeding the Chandrasekhar-Clogston limit in flat-band superconductors: A multiband strong-coupling approach
• Self-consistent surface superconductivity in time-reversal symmetric Weyl semimetals
• Magnon-mediated topological superconductivity in a quantum wire
• Topological nodal $i$-wave superconductivity in PtBi${}_2$
• Ginzburg-Landau theory for unconventional surface superconductivity in PtBi${}_2$
• Interplay between inversion and translation symmetries in trigonal PtBi${}_2$
• Strong-coupling approach to temperature dependence of competing orders of superconductivity: Possible time-reversal symmetry breaking and nontrivial topology
• Spin-dependent quasiparticle lifetimes in altermagnets
• High-Temperature Superconductivity from Finite-Range Attractive Interaction
• Angular momentum of vortex-core Majorana zero modes
• Higher-order topological superconductivity in type-II time-reversal-symmetric Weyl semimetals with a hybrid pairing
• Manipulation of Majorana wave packets at surfaces of nodal noncentrosymmetric superconductors