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arXiv 1504.01951cond-mat.str-el
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掺杂AB2 t-J Hubbard链中的磁性和磁性相

Magnetic and nonmagnetic phases in doped AB2 t-J Hubbard chains

R. R. Montenegro-Filho, M. D. Coutinho-Filho

摘要:

利用密度矩阵重整化群和精确对角化方法讨论了掺杂AB 2 $t-J$链的富相图。的$J$与$δ$(空穴掺杂)的相图展示巡回亚铁磁性,无公度,共振价键和长冈状态,相分离,和Luttinger液体(LL)物理区域。几个功能突出,如调制亚铁磁结构,长冈自旋极化子的发生在欠掺杂制度和小值的$J=4t^2/U$,其中$t$是第一近邻跳跃幅度和$U$是现场排斥库仑相互作用,与非零磁化的无公度结构,和强耦合LL物理在高掺杂制度。我们还验证了相关的研究结果与相应的结果在正方形和n-腿梯形晶格是一致的。特别是,我们提到了长冈铁磁性对$J$和$δ$的不稳定性。

英文摘要:

We discuss the rich phase diagram of doped AB2 $t-J$ chains by using data from density matrix renormalization group and exact diagonalization techniques. The $J$ vs $δ$ (hole doping) phase diagram exhibits regions of itinerant ferrimagnetism, incommensurate, resonating valence bond and Nagaoka states, phase separation, and Luttinger liquid (LL) physics. Several features are highlighted, such as the modulated ferrimagnetic structure, the occurrence of Nagaoka spin polarons in the underdoped regime and small values of $J=4t^2/U$, where $t$ is the first-neighbor hopping amplitude and $U$ is the on-site repulsive Coulomb interaction, incommensurate structures with nonzero magnetization, and strong-coupling LL physics in the high-doped regime. We also verify that relevant findings are in agreement with the corresponding findings in square and n-leg ladder lattices. In particular, we mention the instability of Nagaoka ferromagnetism against $J$ and $δ$.

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