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arXiv math-ph/0009002math-phcond-matmath.MP
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XXZ Heisenberg链中的液滴态

Droplet States in the XXZ Heisenberg Chain

Bruno Nachtergaele, Shannon Starr

摘要:

我们考虑了具有上自旋边界条件的铁磁XXZ链的基态,该链位于具有固定数量下自旋的扇区中。这迫使系统中存在向下自旋的液滴。我们找到了精确的能量和状态,描述这些液滴在无限数量的向下自旋的限制。我们证明了在液滴态以上的光谱中存在一个间隙。由于XXZ哈密顿量在完全磁化的基态上方也具有间隙,这意味着液滴状态(对于足够大的液滴)形成隔离带。在无限大液滴的极限下,这条带的宽度趋于零。我们还证明了类似的结果有限链周期边界条件和无限链。

英文摘要:

We consider the ground states of the ferromagnetic XXZ chain with spin up boundary conditions in sectors with a fixed number of down spins. This forces the existence of a droplet of down spins in the system. We find the exact energy and the states that describe these droplets in the limit of an infinite number of down spins. We prove that there is a gap in the spectrum above the droplet states. As the XXZ Hamiltonian has a gap above the fully magnetized ground states as well, this means that the droplet states (for sufficiently large droplets) form an isolated band. The width of this band tends to zero in the limit of infinitely large droplets. We also prove the analogous results for finite chains with periodic boundary conditions and for the infinite chain.

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。

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