Randomness induced spin-liquid-like phase in the spin-$1/2$ $J_1 - J_2$ triangular Heisenberg model.
We study the effects of bond randomness in the spin-$1/2$ $J_1-J_2$ triangular Heisenberg model using exact diagonalization and density matrix renormalization group. With increasing bond randomness, we identify a randomness induced disordered (RID) phase without any magnetic order, dimer order, spin glass order, or valence-bond glass order. The finite-size scaling of gaps suggests the gapless nature of the spin triplet and singlet excitations, which is supported by the broad continuum of dynamical spin structure factor. By studying the bipartite entanglement spectrum on cylinder system, we find the features of the low-lying spectrum in the RID phase, which may distinguish the RID phase and the $J_1-J_2$ spin liquid phase. We discuss the nature of this spin-liquid-like phase and the indication of our results for understanding triangular spin-liquid-like materials.
Publisher URL: http://arxiv.org/abs/1802.00935
DOI: arXiv:1802.00935v1
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