Searching for superconductivity in doped triangular lattice Kitaev magnets

Andrew Hardy; Ryan Levy; Arun Paramekanti

doi:10.1103/wftz-1syr

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Searching for superconductivity in doped triangular lattice Kitaev magnets

Andrew Hardy, Ryan Levy, Arun Paramekanti

DOI 10.1103/wftz-1syr · Physical Review B

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Abstract

Motivated by exploring correlated metals with frustrating bond-dependent exchange interactions, we study hole- and electron-doped Kitaev Mott insulators on the triangular lattice. Using homogeneous parton mean-field theory, we find that the stripe antiferromagnetic (AFM) order for Kitaev coupling K>0 and the ferromagnetic (FM) order for K<0, both vanish at sufficiently large doping, beyond which we find regimes with chiral d±id singlet pairing and p±ip triplet pairing, respectively. Our tensor network computations, however, reveal that the superconducting correlations are strongly suppressed; while FM order stubbornly persists for the doped K<0 model, the doped K>0 model features emergent spin-charge modulated stripe orders. At higher hole doping for K>0, where AFM order is more strongly suppressed than for the electron-doped case, incorporating a sufficiently strong nearest-neighbor attraction yields evidence for singlet d-wave superconductivity with Luttinger parameter Ksc<1. Our work sets the stage for a broader exploration of doping effects in triangular lattice magnets such as NaRuO2 that feature bond-dependent exchange interactions.