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arXiv quant-ph/0511103quant-phcond-mat.str-el
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一维扩展哈伯德模型中的块-块纠缠和量子相变

Block-block entanglement and quantum phase transitions in one-dimensional extended Hubbard model

Shu-Sa Deng, Shi-Jian Gu, Hai-Qing Lin

摘要:

本文研究了一维扩展哈伯德模型基态中的块-块纠缠。结果表明,由于块-块纠缠包含了非局域关联,因此其相图比局域(单点)纠缠具有更丰富的结构。除了可以用局域纠缠描述的电荷密度波、自旋密度波和相分离相外,单重态超导相也可以在块-块纠缠的等值线图上识别出来。标度分析表明,块-块纠缠的${\rm log}_2(l)$行为在非临界区和临界区都可能存在,但有限尺寸效应会导致某些局部极值。我们还研究了动量空间中的块-块纠缠,讨论了它与单重态超导态到电荷密度波态的相变的关系。

英文摘要:

In this paper, we study block-block entanglement in the ground state of one-dimensional extended Hubbard model. Our results show that the phase diagram derived from the block-block entanglement manifests richer structure than that of the local (single site) entanglement because it comprises nonlocal correlation. Besides phases characterized by the charge-density-wave, the spin-density-wave, and phase-separation, which can be sketched out by the local entanglement, singlet superconductivity phase could be identified on the contour map of the block-block entanglement. Scaling analysis shows that ${\rm log}_2(l)$ behavior of the block-block entanglement may exist in both non-critical and the critical regions, while some local extremum are induced by the finite-size effect. We also study the block-block entanglement defined in the momentum space and discuss its relation to the phase transition from singlet superconducting state to the charge-density-wave state.

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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