Dynamical Phase Transitions in the Photodriven Charge-Ordered Dirac-Electron System
Dynamical Phase Transitions in the Photodriven Charge-Ordered Dirac-Electron System
复制标题
光驱动电荷有序狄拉克电子系统中的动态相变
DOI：
10.1103/physrevlett.129.047402
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发表时间：
2022
影响因子：
8.6
通讯作者：
Mochizuki Masahito
中科院分区：
文献类型：
--
作者：
Tanaka Yasuhiro;Mochizuki Masahito
本文以有机盐为研究对象，从理论上研究了具有电荷有序基态的dirac -电子相互作用系统的光致相变和电荷动力学。通过基于时间相关Schrödinger方程和Floquet理论的数值模拟方法分析该化合物的扩展Hubbard模型，我们观察到在圆偏振光照射下，从电荷有序绝缘体到无间隙狄拉克半金属，最终到陈氏绝缘体相的连续动态相变。这些相变的发生是圆偏振光的两个主要作用的结果，即通过熔化电荷序来关闭电荷隙和通过打破狄拉克点的时间反转对称性来打开拓扑隙。我们证明了这些光致现象是由驱动相关狄拉克电子的电荷动力学控制的。
We study photoinduced phase transitions and charge dynamics in the interacting Dirac-electron system with a charge-ordered ground state theoretically by taking an organic salt. By analyzing 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.