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arXiv 2109.07010cond-mat.str-elcond-mat.quant-gascond-mat.stat-mechcond-mat.supr-conmath-phmath.MP
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扩展的SU($N$)哈伯德模型的精确本征态:具有$N$ -粒子非对角长程序的$η$ -配对态的推广

Exact eigenstates of extended SU($N$) Hubbard models: Generalizations of $η$-pairing states with $N$-particle off-diagonal long-range order

Hironobu Yoshida, Hosho Katsura

摘要:

我们考虑了$N$ -分量费米子链中$N$-配对态的$N$ -粒子推广,并证明了这些态是扩展SU($N$)哈伯德模型的精确(高能)本征态.我们计算了态的单重关联函数,发现它的行为对于偶数和奇数$N$是定性不同的。当$N$为偶数时,这些态在$N$ -粒子约化密度矩阵中呈现非对角长程序。另一方面,当$N$是奇数时,相关性随体积中的距离呈指数衰减,但端到端相关性在热力学极限下不会消失。最后,我们证明了这些状态是唯一的基态适当定制的哈密顿量。

英文摘要:

We consider $N$-particle generalizations of $η$-pairing states in a chain of $N$-component fermions and show that these states are exact (high-energy) eigenstates of an extended SU($N$) Hubbard model. We compute the singlet correlation function of the states and find that its behavior is qualitatively different for even and odd $N$. When $N$ is even, these states exhibit off-diagonal long-range order in $N$-particle reduced density matrix. On the other hand, when $N$ is odd, the correlations decay exponentially with distance in the bulk, but end-to-end correlations do not vanish in the thermodynamic limit. Finally, we prove that these states are the unique ground states of suitably tailored Hamiltonians.

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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