Parity-mixing superconducting phase in the Rashba-Hubbard model and its topological properties from dynamical mean field theory

Abstract

We investigate parity-mixing superconductivity in the two-dimensional Hubbard model with Rashba spin-orbit coupling, using Cellular Dynamical Mean-Field Theory (CDMFT). A superconducting state with mixed singlet $d$-wave and triplet $p$-wave character is found in a wide range of doping. The singlet component decreases with the amplitude of the Rashba spin-orbit coupling, whereas the triplet component increases, but both disappear at about 20\% doping. The effect of a Zeeman field is also investigated; it tends to suppress both types of superconductivity, but induces nontrivial topological properties: the computed bulk Chern number is nonzero in the mixed superconductivity phase, at least in the underdoped region. A strong suppression of the excitation gap occurs slightly after optimal doping; this might be the sign of a topological transition within the superconducting dome.

7 pages, 4 figures

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Cited by in corpus (8)

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• Strongly parity-mixed superconductivity in Rashba-Hubbard model
• Spin texture in a bilayer high-temperature cuprate superconductor
• Superconductivity near the saddle point in the two-dimensional Rashba system Si(111)-$\sqrt{3}\times \sqrt{3}$-(Tl,Pb)
• Spin singlet topological superconductivity in the attractive Rashba Hubbard model
• Mixed-parity superconductivity near Lifshitz transitions in strongly spin-orbit-coupled metals
• Localization and Topology in Noncentrosymmetric Superconductors with Disorder
• Rashba Spin-Orbit Coupling and Nonlocal Correlations in Disordered 2D Systems