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.
Temperature dependence of surface superconductivity in t-PtBi$_2$
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abstract
The Weyl semimetal trigonal PtBi$_2$ has recently been identified as a promising candidate material for intrinsic topological surface superconductivity emerging from the Fermi arc states of the material with a sizeable superconducting gap. We report the temperature evolution of the superconducting excitation spectrum using scanning tunneling spectroscopy in the range of $8-45\,$K. A large low-temperature gap in the order of $\Delta \approx 9\,$meV and a closing of the gap around $T_c \approx 45\,$K is observed. Thus, our results confirm the previously indicated high $T_c$-like superconductivity in t-PtBi$_2$.
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Three prerequisites for high-temperature superconductivity in t-PtBi$_2$
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.