论文标题
在条纹Dirac Fermion Systems中转运各向异性和金属绝缘体过渡
Transport anisotropy and metal-insulator transition in striped Dirac fermion systems
论文作者
论文摘要
使用行列式量子蒙特卡洛法，我们研究了相互作用的二维Dirac Fermion系统中电荷密度条纹引起的金属构造物转变。条纹将引入转运各向异性并将中间相放入系统中，并伴随着带结构的变化和费米能量周围状态的密度峰。在牢固相关性的情况下，条纹通过缩小能量隙并破坏磁性阶的竞争与库仑排斥相竞争，并最终将系统驱动到莫特绝缘阶段回到金属状态。我们的结果可能会通过在实验中设置电荷条件来提供一种可行的方法来修改运输属性。
Using the determinant quantum Monte Carlo method, we investigate the metal-insulator transitions induced by the stripe of charge density in an interacting two-dimensional Dirac fermion system. The stripe will introduce the transport anisotropy and insulating intermediate phase into the system, accompanied by the change of band structure and a peak of density of states around Fermi energy. In the case of strong correlation, stripe exhibits competition with Coulomb repulsion through closing the energy gap and disrupting the magnetic order, and finally drives the system in Mott insulating phase back to the metallic state. Our results may provide a feasible way to modify transport properties by setting charge stripes in experiments.
