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Sizable superconducting gap and anisotropic chiral topological superconductivity in the Weyl semimetal PtBi₂

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arxiv 2507.13843 v1 pith:SFRCWG5T submitted 2025-07-18 cond-mat.supr-con cond-mat.mtrl-sci

Sizable superconducting gap and anisotropic chiral topological superconductivity in the Weyl semimetal PtBi$_2$

Xiaochun Huang , Lingxiao Zhao , Sebastian Schimmel , Julia Besproswanny , Patrick H\"artl , Christian Hess , Bernd B\"uchner , Matthias Bode This is my paper
classification cond-mat.supr-con cond-mat.mtrl-sci
keywords topologicaldeltaptbisurfacespatialsuperconductivityabssanisotropic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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abstract

Topological superconductors offer a fertile ground for realizing Majorana zero modes -- topologically protected, zero-energy quasiparticles that are resilient to local perturbations and hold great promise for fault-tolerant quantum computing. Recent studies have presented encouraging evidence for intrinsic topological superconductivity in the Weyl semimetal trigonal PtBi$_2$, hinting at a robust surface phase potentially stable beyond the McMillan limit. However, due to substantial spatial variations in the observed superconducting (SC) gap $\Delta$ the nature of the underlying order parameter $\Delta$($k$) remained under debate. Here we report the realization of sizable surface SC gaps ($\Delta > 10\,\mathrm{meV}$) in PtBi$_2$, exhibiting remarkable spatial uniformity from hundreds of nanometers down to the atomic level, as revealed by scanning tunneling microscopy and spectroscopy. Building on this spatial homogeneity -- indicative of long-range phase coherence -- we uncover previously unobserved low-energy Andreev bound states (ABSs) that ubiquitously emerge within the SC gap across the surface. Theoretical simulations that closely reproduce the experimental spectra, reveal an anisotropic chiral pairing symmetry of $\Delta$($k$), and further suggest that the observed ABSs are of topological origin. The combination of a large, nontrivial pairing gap and accessible surface states establishes PtBi$_2$ as a compelling platform for investigating topological superconductivity and its associated Majorana modes.

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Cited by 8 Pith papers

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  1. Beyond spin-1/2: Multipolar spin-orbit coupling in noncentrosymmetric crystals with time-reversal symmetry

    cond-mat.mes-hall 2025-12 unverdicted novelty 8.0

    A multipolar k·p theory for C3v crystals reveals band-dependent total-angular-momentum textures with vorticities |W_n|=1,2,5 that produce nonmonotonic current-induced spin polarization responses.

  2. Kohn-Luttinger Superconductivity of Weyl Fermi Arcs in PtBi$_2$

    cond-mat.supr-con 2026-05 unverdicted novelty 6.0

    Kohn-Luttinger pairing on Weyl Fermi arcs in PtBi2 yields a robust i-wave superconducting instability with an intra-arc node matching experiment.

  3. Mechanism for Nodal Topological Superconductivity on PtBi$_2$ Surface

    cond-mat.supr-con 2025-12 unverdicted novelty 6.0

    Anisotropic electron-phonon coupling with screened Coulomb repulsion yields nodal gaps in PtBi2 surface superconductivity when bandwidth approximates phonon energy.

  4. Mechanism for Nodal Topological Superconductivity on PtBi$_2$ Surface

    cond-mat.supr-con 2025-12 conditional novelty 6.0

    Anisotropic electron-phonon coupling plus screened Coulomb repulsion on Weyl-semimetal Fermi arcs yields the observed nodal i-wave superconducting gap when the surface bandwidth matches the phonon energy scale.

  5. Fermiology and spin polarization of topological surface states in PtBi$_2$

    cond-mat.supr-con 2026-07 unverdicted novelty 5.0

    Spin-ARPES on PtBi2 shows spin-polarized singly degenerate Fermi-arc surface states with termination-dependent dispersion, supporting its candidacy for topological superconductivity.

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    cond-mat.supr-con 2026-05 unverdicted novelty 5.0

    Kohn-Luttinger calculation on Weyl Fermi arcs in PtBi2 yields robust i-wave superconductivity with intra-arc nodes.

  7. Three prerequisites for high-temperature superconductivity in t-PtBi$_2$

    cond-mat.supr-con 2025-09 conditional novelty 5.0

    ARPES and DFT show that t-PtBi2 surface Fermi arcs host a van Hove singularity and a momentum-dependent flat band, with spatially varying arc size that could tune superconductivity.

  8. Disentangling bulk and surface states in the electronic structure of PtBi$_2$(0001)

    cond-mat.str-el 2026-07 accept novelty 4.0

    Photon-energy and polarization-dependent ARPES plus DFT disentangle and assign bulk and surface states on both DH and KL terminations of PtBi2(0001), with orbital character matching polarization trends.