Candidate quantum spin liquids on the maple-leaf lattice
arxiv(2024)
摘要
Motivated by recent numerical studies reporting putative quantum paramagnetic
behavior in spin-1/2 Heisenberg models on the maple-leaf lattice, we classify
Abrikosov fermion mean-field Ansätze of fully symmetric U(1) and
ℤ_2 quantum spin liquids within the framework of projective
symmetry groups. We obtain a total of 17 U(1) and 12 ℤ_2
algebraic PSGs, and, upon restricting their realization via mean-field
Ansätze with nearest-neighbor amplitudes (relevant to the studied models),
only 12 U(1) and 8 ℤ_2 distinct phases are obtained. We present
both singlet and triplet fields for all Ansätze up to third nearest-neighbor
bonds and discuss their spinon dispersions as well as their dynamical spin
structure factors. We further assess the effects of Gutzwiller projection on
the equal-time spin structure factors, and identify a U(1) Fermi surface spin
liquid whose structure factor most closely reproduces the one obtained from
pseudo-fermion functional renormalization group calculations.
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