论文标题
在光电荷订购的Dirac-Electron系统中的动力相变
Dynamical phase transitions in the photodriven charge-ordered Dirac-electron system
论文作者
论文摘要
理论上，通过使用有机盐$α$ - （bedt-ttf）$ _ 2 $ i $ _3 $，研究了具有电荷订购基态的相互作用的Dirac-电子系统中的光诱导的相变和电荷动力。通过基于时间依赖性的Schrödinger方程和Floquet理论分析该化合物的扩展Hubbard模型，我们观察到从电荷订购的绝缘子到无质量的无毛线半离子，最终与循环的无辐射相关的无线电辐射。这些相变是由于圆形极化光的两个主要影响，即，通过融化电荷顺序和打开拓扑间隙的闭合，通过打破DIRAC点上的时间倒数对称性来弥补电荷间隙。我们证明了这些光诱导的现象受驱动相关狄拉克电子的电荷动力学的控制。
Photoinduced phase transitions and charge dynamics in the interacting Dirac-electron system with a charge-ordered ground state are theoretically studied by taking an organic salt $α$-(BEDT-TTF)$_2$I$_3$. By analysing the extended Hubbard model for this compound using a combined method of numerical simulations based on the time-dependent Schrödinger equation and the Floquet theory, we observe successive dynamical phase transitions from the charge-ordered insulator to a gapless Dirac semimetal and, eventually, to a Chern insulator phase under irradiation with circularly polarized light. These phase transitions occur as a consequence of two major effects of circularly polarized light, i.e., closing of the charge gap through melting the charge order and opening of the topological gap by breaking the time reversal symmetry at the Dirac points. We demonstrate that these photoinduced phenomena are governed by charge dynamics of driven correlated Dirac electrons.
