arXiv:cond-mat/0511079 · Physical Review B
Probable absence of a quadrupolar spin-nematic phase in the bilinear-biquadratic spin-1 chain
K. Buchta, Gábor Fáth, Örs Legeza, Jenő Sólyom
Abstract
We study numerically the ground-state phase diagram of the bilinear-biquadratic spin-1 chain near the ferromagnetic instability point, where the existence of a gapped or gapless nondimerized quantum nematic phase has been suggested. Our results, obtained by a highly accurate density-matrix renormalization-group calculation, are consistent with the view that the order parameter characterizing the dimer phase vanishes only at the point where the system becomes ferromagnetic, although the existence of a gapped or gapless nondimerized phase in a very narrow parameter range between the ferromagnetic and the dimerized regimes cannot be ruled out.