Continuous Mott transition in a two-dimensional Hubbard model
Continuous Mott transition in a two-dimensional Hubbard model
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DOI：
10.1103/physrevb.90.085113
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发表时间：
2014-03
影响因子：
3.7
通讯作者：
Y. Yanagi;K. Ueda
中科院分区：
文献类型：
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作者：
Y. Yanagi;K. Ueda
利用8格点胞腔动力学平均场理论研究了半填充时1/5耗尽正方晶格Hubbard模型中的金属-绝缘体相变。我们发现在一定的参数范围内，发生了一个没有一级相变特征的金属-绝缘体相变，即连续的Mott相变。连续Mott跃迁的本质是由在位库仑相互作用驱动的Lifshitz跃迁。跃迁的重正化矩阵元和自旋-自旋关联函数表明，由于电子-电子相互作用的非局域效应，该跃迁的物理过程是对二聚化的强烈增强.
We investigate nonmagnetic metal-insulator transition in the 1/5-depleted square lattice Hubbard model at half-filling within the 8-site cellular dynamical mean field theory. We find that a metal-insulator transition without any signatures of the first order transition, a continuous Mott transition, takes place in a certain range of parameters. The nature of the continuous Mott transition is nothing but a Lifshitz transition driven by the on-site Coulomb interaction. The renormalized matrix elements of hoppings and the spin-spin correlation functions reveal that physics of this transition is strong enhancement of the dimerization due to the non-local effects of electron-electron interaction.