Randomness-induced spin-liquid-like phase in the spin- 1 2 J 1 − J 2 triangular Heisenberg model

摘要: We study the effects of bond randomness in spin-$1/2$ ${J}_{1}\ensuremath{-}{J}_{2}$ triangular Heisenberg model using exact diagonalization and density-matrix renormalization group. With increasing randomness, we identify a randomness-induced spin-liquid-like phase without any magnetic order, dimer spin-glass or valence-bond-glass order. The finite-size scaling gaps suggests gapless nature both spin triplet singlet excitations, which is further supported by broad continuum dynamical structure factor. By studying bipartite entanglement spectrum system on cylinder geometry, features low-lying phase, may distinguish this intrinsic spin-liquid clean model. discuss indication our results for understanding materials with triangular-lattice structure.