Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd

Abstract

Materials with strong spin-orbit coupling (SOC) have in recent years become a subject of intense research due to their potential applications in spintronics and quantum information technology. In particular, in systems which break inversion symmetry, SOC facilitates the Rashba-Dresselhaus effect, leading to a lifting of spin degeneracy in the bulk and intricate spin textures of the Bloch wave functions. Here, by combining angular resolved photoemission (ARPES) and low temperature scanning tunneling microscopy (STM) measurements with relativistic first-principles band structure calculations, we examine the role of SOC in single crystals of noncentrosymmetric BiPd. We report the detection of several Dirac surface states, one of which exhibits an extremely large spin splitting. Unlike the surface states in inversion-symmetric systems, the Dirac surface states of BiPd have completely different properties at opposite faces of the crystal and are not trivially linked by symmetry. The spin-splitting of the surface states exhibits a strong anisotropy by itself, which can be linked to the low in-plane symmetry of the surface termination.

arXiv comment6 page letter, + supplementary material

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Cited by in corpus (17)

• Spin-triplet pairing state evidenced by half-quantum flux in a noncentrosymmetric superconductor
• Evidence of topological nodal lines and surface states in the centrosymmetric superconductor SnTaS2
• Quantum oscillations and a non-trivial Berry phase in the noncentrosymmetric superconductor BiPd
• Dirac State in a Centrosymmetric Superconductor alpha-PdBi2
• Local noncentrosymmetric structure of Bi2Sr2CaCu2O8+y by X-ray magnetic circular dichroism at Cu K-edge XANES
• Electronic structure and superconductivity of the non-centrosymmetric Sn${}_4$As${}_3$
• Anomalies in the core level spectroscopy of a noncentrosymmetric solid, BiPd
• Correct Brillouin zone and electronic structure of BiPd
• Exceptional Dirac states in a non-centrosymmetric superconductor, BiPd
• Low-Energy Surface States in the Normal State of $\alpha$-PdBi2 Superconductor
• Low-temperature thermal expansion of the topological material candidates $\beta$-PtBi${}_2$ and $\beta$-Bi${}_2$Pd
• Kinetic stabilization of 1D surface states near twin boundaries in noncentrosymmetric BiPd
• Fermi surface and band structure of BiPd from ARPES studies
• Atomic-scale tailoring of spin susceptibility via non-magnetic spin-orbit impurities
• Temperature dependence of the lower critical field of the noncentrosymmetric superconductor $\alpha$-BiPd
• Anomalous spectral evolution with bulk sensitivity in BiPd
• Conventional superconductivity in single-crystalline BiPt