arXivDaily arXiv每日学术速递 周一至周五更新
arXiv quant-ph/0310030quant-ph
收藏

哈伯德模型中的局域纠缠和量子相变

Local entanglement and quantum phase transition in the Hubbard model

Shi-Jian Gu, You-Quan Li, Hai-Qing Lin

摘要:

基于一维哈伯德模型的Bethe-Anonymous解,研究了该模型的局域纠缠$E_v$.得到了局域纠缠与在位库仑相互作用$U$之间的关系。结果表明,在半满状态下,$E_v$是$U$的偶解析函数,在临界点U=0处达到最大值.局域纠缠随填充因子的变化表明,对称性最大的基态具有最大的纠缠。磁场使局域纠缠度减小,在饱和磁化强度下趋于零。在位库仑相互作用总是抑制局域纠缠。

英文摘要:

The local entanglement $E_v$ of the one-dimensional Hubbard model is studied on the basis of its Bethe-ansatz solution. The relationship between the local entanglement and the on-site Coulomb interaction $U$ is obtained. Our results show that $E_v$ is an even analytic function of $U$ at half-filling and it reaches a maximum at the critical point U=0. The variation of the local entanglement with the filling factor shows that the ground state with maximal symmetry possesses maximal entanglement. The magnetic field makes the local entanglement to decrease and approach to zero at saturated magnetization. The on-site Coulomb interaction always suppresses the local 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。

↑