Effect of the three-center terms on the chiral superconducting d-wave pairing of the Hubbard fermions on the triangular lattice

Abstract

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractUsing the diagram technique for the Hubbard operators an integral equation that determines the order parameter of the superconducting phase Δ(p) was obtained in the framework of t − J − V and t − J * − V models on triangular lattice. It is shown that there are two scenarios of formation of superconducting phase with gapless spectrum at the critical concentration of carriers x c . The effect of three-center terms on implementation of this phase was also considered.

Stability of the coexistence phase of chiral superconductivity and noncollinear spin ordering with a nontrivial topology and strong electron correlations

“…The excitation spectrum in the noncollinear magnetic phase is gapless on the Fermi contour (the line in the 2D Brillouin zone) at all levels of doping. In the superconducting phase with the chiral d 1 + id 2 symmetry of the order parameter the gapless excitations are realized only at the specific points of the Brillouin zone (nodal points) with position depending on the electron density [25].…”

Majorana vortex modes in spin-singlet chiral superconductors with noncollinear spin ordering: Local density of states study

“…Therefore, the chiral superconductor has the gapped excitation spectrum under wide conditions in the homogeneous case with the periodic boundary conditions. The energy gap is closed only for certain parameters when the Fermi contour intersects the set of nodal points [23,24]. It is supposed that the d 1 + id 2 -wave superconductivity can be formed in triangular and hexagonal lattice systems [25][26][27].…”