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arXiv 1811.03344cond-mat.str-elquant-ph
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一维哈伯德模型矩阵乘积态的有限纠缠特性

Finite entanglement properties in the matrix product states of the one-dimensional Hubbard model

Min-Chul Cha

摘要:

通过将基态表示为矩阵乘积态的形式,研究了一维哈伯德模型中有限纠缠的影响。在半填充状态下观察到了宽范围内的量子纠缠标度行为。的临界指数表征的长度尺度的矩阵的大小方面获得,证实了理论预测的指数的值完全由中心荷。纠缠谱表明,在带电荷隙的基态中,存在着全局双简并。我们还发现,莫特过渡,调整通过改变化学势,总是发生通过一级过渡和金属相有几个导电状态,包括国家的平均场性质接近临界点,预期在变分矩阵产品状态与有限量的纠缠。

英文摘要:

We study the effects due to limited entanglement in the one-dimensional Hubbard model by representing the ground states in the form of the matrix product states. Finite-entanglement scaling behavior over a wide range is observed at half-filling. The critical exponents characterizing the length scale in terms of the size of matrices used are obtained, confirming the theoretical prediction that the values of the exponents are solely determined by the central charge. The entanglement spectrum shows that a global double degeneracy occurs in the ground states with a charge gap. We also find that the Mott transition, tuned by changing the chemical potential, always occurs through a first-order transition and the metallic phase has a few conducting states, including the states with the mean-field nature close to the critical point, as expected in variational matrix product states with a finite amount of entanglement.

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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