A continuous family of fully-frustrated Heisenberg model on the Kagome lattice

Abstract

We find that the antiferromagnetic Heisenberg model on the Kagome lattice with nearest neighboring exchange coupling(NN-KAFH) belongs to a continuous family of fully-frustrated Heisenberg model on the Kagome lattice, which has no preferred classical ordering pattern. The model within this family consists of the first, second and the third neighboring exchange coupling $J_1$, $J_2$, and $J_3$, with $J_2=J_3$. We find that when $-J_1\le J_2=J_3\le 0.2J_1$, the lowest band of $J(\mathbf{q})$, namely, the Fourier transform of the exchange coupling, is totally non-dispersive. Exact diagonalization calculation indicates that the ground state of the spin-$\frac{1}{2}$ NN-KAFH is locally stable under the perturbation of $J_2$ and $J_3$ when and only when $J_2=J_3$. Interestingly, we find that the same flat band physics is also playing an important role in the RVB description of the spin liquid state on the Kagome lattice. In particular, we show that the extensively studied $U(1)$ Dirac spin liquid state on the Kagome lattice can actually be generated from a continuous family of gauge inequivalent RVB mean field ansatz, which host very different mean field spinon dispersion.

5 pages, 7 figures. A correction made on the localized Wannier orbital of the flat band of the spinon model

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Cited by in corpus (7)

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• Pinch-points to half-moons and up in the stars: the kagome skymap
• Gutzwiller-projected states for the $J_1$-$J_2$ Heisenberg model on the kagome lattice: achievements and pitfalls
• Partial lifting of degeneracy in the $J_1-J_2-J_3$ Ising antiferromagnet on the kagome lattice
• Competing emergent Potts orders and possible nematic spin liquids in the Kagome $J_1-J_3$ Heisenberg model
• Schwinger boson theory of the J1,J2=J3 kagome antiferromagnet
• Strong relevance of Zinc impurity in the spin-$\frac{1}{2}$ Kagome quantum antiferromagnets: a variational study