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

Article

关键词: DIMENSIONS;    FERMIONS;   

DOI  :  10.1103/PhysRevB.98.245118

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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