Superconducting density of states and bandstructure at the surface of the candidate topological superconductor Au2Pb

Abstract

The electronic bandstructure of Au${}_2$Pb has a Dirac cone which gaps when undergoing a structural transition into a low temperature superconducting phase. This suggests that the superconducting phase ($T_c=1.1$ K) might hold topological properties at the surface. Here we make Scanning Tunneling Microscopy experiments on the surface of superconducting Au${}_2$Pb. We measure the superconducting gap and find a sizeable superconducting density of states at the Fermi level. We discuss possible origins for this finding in terms of superconductivity induced into surface states.

References in corpus (20)

• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Dirac materials
• Superconducting density of states and vortex cores of 2H-NbS2
• Specific heat and $\mu$SR study on the noncentrosymmetric superconductor LaRhSi3
• Type I superconductivity in the Dirac semimetal PdTe2
• The Suprafroth (Superconducting Froth)
• Morphology of the Superconducting Vortex Lattice in Ultra-Pure Niobium
• Superconductivity in CaBi${}_2$
• Exceptional type-I superconductivity of the layered silver oxide Ag${}_5$Pb${}_2$O${}_6$
• Type-I superconductivity in noncentrosymmetric superconductor AuBe
• Superconductivity in the surface state of noble metal gold and its Fermi level tuning by EuS dielectric
• Anisotropic type-I superconductivity and anomalous superfluid density in OsB 2
• Type-I superconductivity in Al${}_6$Re
• Millikelvin scanning tunneling microscope at 20/22 T with a graphite enabled stick-slip approach and an energy resolution below 8$\mu$eV: Application to conductance quantization at 20 T in single atom point contacts of Al and Au
• Electronic Band Structure and Superconducting Properties of SnAs
• Simplified feedback control system for Scanning Tunneling Microscopy
• Visualization by scanning SQUID microscopy of the intermediate state in the superconducting Dirac semimetal PdTe${}_2$
• Fully gapped superconducting state in Au2Pb: a natural candidate for topological superconductor
• Emergence of Topological Superconductivity in Doped Topological Dirac Semimetals under Symmetry-Lowering Lattice Distortions

Cited by in corpus (5)

• Band structure, superconductivity and polytypism in AuSn${}_4$
• Superconducting density of states of PtPb4
• Superconducting density of states and vortex lattice of LaRu${}_2$P${}_2$ observed by Scanning Tunneling Spectroscopy
• Advanced approach of superconducting gap function extraction from tunneling experiments
• Termination dependence of the surface states in Pb${}_2$Pd