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arXiv 1305.3571cond-mat.str-el
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二维半满SU(2N)哈伯德模型中竞争序的钉扎场量子蒙特卡罗模拟

Competing orders in the 2D half-filled SU(2N) Hubbard model through the pinning field quantum Monte-Carlo simulations

Da Wang, Yi Li, Zi Cai, Zhichao Zhou, Yu Wang, Congjun Wu

摘要:

利用投影行列式量子蒙特卡罗模拟结合局域钉扎场方法,非微扰地研究了正方格子中二维半填充SU($2N$)哈伯德模型的基态磁性.在小的和中等的$U$值下,SU(4)和SU(6)的长程Neel序都被发现。在这两种情况下,长程Neel矩表现出相对于$U$的非单调行为,随着$U$的增加,长程Neel矩首先增长,然后下降。这一结果与SU(2)情形下的Neel矩单调增加并饱和有根本的不同。在SU(6)情形下,在强相互作用区发现了向柱状二聚体相的转变。

英文摘要:

We non-perturbatively investigate the ground state magnetic properties of the 2D half-filled SU($2N$) Hubbard model in the square lattice by using the projector determinant quantum Monte Carlo simulations combined with the method of local pinning fields. Long-range Neel orders are found for both the SU(4) and SU(6) cases at small and intermediate values of $U$. In both cases, the long-range Neel moments exhibit non-monotonic behavior with respect to $U$, which first grow and then drop as $U$ increases. This result is fundamentally different from the SU(2) case in which the Neel moments increase monotonically and saturate. In the SU(6) case, a transition to the columnar dimer phase is found in the strong interaction regime.

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