Type-II Ising Pairing in Few-Layer Stanene

Abstract

Spin-orbit coupling has proven indispensable in realizing topological materials and more recently Ising pairing in two-dimensional superconductors. This pairing mechanism relies on inversion symmetry breaking and sustains anomalously large in-plane polarizing magnetic fields whose upper limit is expected to diverge at low temperatures, although experimental demonstration of this has remained elusive due to the required fields. In this work, the recently discovered superconductor few-layer stanene, i.e. epitaxially strained $\alpha$-Sn, is shown to exhibit a new type of Ising pairing between carriers residing in bands with different orbital indices near the $\Gamma$-point. The bands are split as a result of spin-orbit locking without the participation of inversion symmetry breaking. The in-plane upper critical field is strongly enhanced at ultra-low temperature and reveals the sought for upturn.

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• Revealing the two-dimensional electronic structure and anisotropic superconductivity in a natural van der Waals superlattice (PbSe)${}_{1.14}$NbSe${}_2$
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• Theory of intervalley-coherent AFM order and topological superconductivity in tWSe${}_2$
• Chemical Principles of Intrinsic Topological Superconductors
• Evolution of flat bands in MoSe${}_2$/WSe${}_2$ moiré lattices: A study combining machine learning and band unfolding methods
• Extreme orbital ab-plane upper critical fields far beyond Pauli limit in 4Hb-Ta(S, Se)2 bulk crystals
• Microscopic theory of in-plane critical field in two-dimensional Ising superconducting systems
• Monoclinic LaSb${}_2$ Superconducting Thin Films
• Tunable critical field in Rashba superconductor thin-films
• 3D Topological Semimetal Phases of Strained $\alpha$-Sn on Insulating Substrate
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• Two-Fold Anisotropic Superconductivity in Bilayer T${}_d$-MoTe${}_2$
• Unconventional pairing in Ising superconductors: Application to monolayer NbSe${}_2$
• Constructing the Fulde-Ferrell-Larkin-Ovchinnikov state in antiferromagnetic insulator CrOCl
• Violation of Pauli Limit at KTaO3(110) Interfaces
• Thermodynamic parameters of atomically thin superconductors derived from the upper critical field
• Multiple types of spin textures and robust valley physics in MP${}_2$X${}_6$
• Oscillatory magnetic field-dependent critical temperatures of ultraclean Type-II superconductors
• Ab initio study of orbital-selective superconductivity in $\gamma$-BiPd