Phase diagram for hole-doped Kitaev systems on the honeycomb lattice

In extended Kitaev models on the honeycomb lattice, off-diagonal interactions (e.g., the Gamma, Gamma' terms) can give rise to non-Kitaev quantum spin liquids and several magnetically ordered phases. In the present paper, we dope holes to the system and study the resultant t-K-Gamma-Gamma' model using mean-field theory. The interplay between the charge and spin degrees of freedom results in a rich phase diagram Similar to doped cuprates, superconductors, pseudogap phases, Fermi liquid, strange metal and paramagnetic phase are generated. What is different is that, we obtain more than one superconducting phase (including a topological one) and more than one pseudogap phase no matter what the original spin state is. The Chern number of the topological superconductor is either v = +/- 2 or v = +/- 1, depending on the ratio Gamma/vertical bar K vertical bar in the spin channel. We further find that an intermediate in-plane magnetic field can slightly enlarge the size of the topological superconducting phase.

Automated summary

In extended Kitaev models on the honeycomb lattice, doping holes into the system results in a rich phase diagram of the t-K-Gamma-Gamma' model, showing the interplay between charge and spin degrees of freedom. Multiple superconducting and pseudogap phases are generated, with a Chern number of the topological superconductor being either v = +/- 2 or v = +/- 1. The presence of an intermediate in-plane magnetic field slightly enlarges the topological superconducting phase.