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 math-ph/0110017math-phcond-matmath.MP
收藏

铁磁自旋J XXZ链的能隙

The spectral gap for the ferromagnetic spin-J XXZ chain

Tohru Koma, Bruno Nachtergaele, Shannon Starr

摘要:

我们研究了自旋J铁磁XXZ链的扭结基态以上的谱。我们的主要定理是,对于J的所有值,在该模型的所有基态之上都存在非零的能隙。使用各种方法,我们获得了关于这个能隙的大小、关于大Δ的行为、关于作为Δ的函数的它的整体行为及其对基态的依赖性、关于能隙的标度和大J的低位谱的结构的额外信息,以及激发谱中孤立本征值的存在性。通过结合微扰理论,数值计算和渐近分析得到的信息,我们得出了一些有趣的结果。主要定理的证明,以及一些数值结果,依赖于与固体上固体(SOS)近似的比较结果。这个SOS模型本身提出了有趣的问题,在组合学,我们相信它将被证明是有用的,在研究接口的XXZ模型在更高的维度。

英文摘要:

We investigate the spectrum above the kink ground states of the spin J ferromagnetic XXZ chain. Our main theorem is that there is a non-vanishing gap above all ground states of this model for all values of J. Using a variety of methods, we obtain additional information about the magnitude of this gap, about its behavior for large Δ, about its overall behavior as a function of Δand its dependence on the ground state, about the scaling of the gap and the structure of the low-lying spectrum for large J, and about the existence of isolated eigenvalues in the excitation spectrum. By combining information obtained by perturbation theory, numerical, and asymptotic analysis we arrive at a number of interesting conjectures. The proof of the main theorem, as well as some of the numerical results, rely on a comparison result with a Solid-on-Solid (SOS) approximation. This SOS model itself raises interesting questions in combinatorics, and we believe it will prove useful in the study of interfaces in the XXZ model in higher dimensions.

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。

↑