arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1301.3207cond-mat.str-elhep-lat
收藏

二维旋子的禁闭与退禁闭

Confinement and Deconfinement of Spinons in Two Dimensions

Ying Tang, Anders W. Sandvik

摘要:

我们用Monte Carlo方法研究了二维量子自旋系统中的自旋子,刻画了它们的本征尺寸$λ$和限制长度$Λ$。我们证实了自旋子在共振价键自旋液体状态下是非受限的,$Λ\to \infty$和$λ$是有限的。在价键固体中,我们发现了有限的$λ$和$Λ$,其中单个自旋的$λ$明显大于束缚态--自旋是软的,并且随着束缚态的形成而收缩。当接近分离价键固体和Néel基态的临界点时,$λ$和$Λ$都发散。我们的结论是,自旋解除禁闭是边缘的最低能量状态的自旋1部门,由于弱的吸引力自旋相互作用。在临界点附近的退禁闭应该发生在更高的能量下。

英文摘要:

We use Monte Carlo methods to study spinons in two-dimensional quantum spin systems, characterizing their intrinsic size $λ$ and confinement length $Λ$. We confirm that spinons are deconfined, $Λ\to \infty$ and $λ$ finite, in a resonating valence-bond spin-liquid state. In a valence-bond solid, we find finite $λ$ and $Λ$, with $λ$ of a single spinon significantly larger than the bound-state---the spinon is soft and shrinks as the bound state is formed. Both $λ$ and $Λ$ diverge upon approaching the critical point separating valence-bond solid and Néel ground states. We conclude that the spinon deconfinement is marginal in the lowest-energy state in the spin-1 sector, due to weak attractive spinon interactions. Deconfinement in the vicinity of the critical point should occur at higher energies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑