标题： 光诱导的1T-TaS$_{2}$中共格电荷密度波的动力学 基于三轨道哈伯德模型 显示英文标题

标题： Photoinduced Dynamics of Commensurate Charge Density Wave in 1T-TaS$_{2}$ Based on Three-Orbital Hubbard Model

摘要： 我们研究了层状化合物1T-TaS$_{2}$在超短激光脉冲驱动下的共格电荷密度波（CDW）相中的耦合电荷-晶格动力学。 为了描述其电子结构，我们采用了一个紧束缚模型，该模型包括与CDW序相关的晶格畸变效应。 我们进一步添加了局域库仑相互作用，并在平均场分析中再现了费米能级处的能隙。 基于电子和晶格畸变的运动方程，我们数值研究了它们在超短激光脉冲驱动下的动力学行为。 我们发现，在激光照射期间CDW序会减少甚至消失，而晶格畸变几乎被冻结。 我们还发现，晶格运动在更长的时间尺度上开始，并在激光照射后导致CDW序进一步减少。 显示英文摘要

摘要： We study the coupled charge-lattice dynamics in the commensurate charge density wave (CDW) phase of the layered compound 1T-TaS$_{2}$ driven by an ultrashort laser pulse. For describing its electronic structure, we employ a tight-binding model of previous studies including the effects of lattice distortion associated with the CDW order. We further add on-site Coulomb interactions and reproduce an energy gap at the Fermi level within a mean-field analysis. On the basis of coupled equations of motion for electrons and the lattice distortion, we numerically study their dynamics driven by an ultrashort laser pulse. We find that the CDW order decreases and even disappears during the laser irradiation while the lattice distortion is almost frozen. We also find that the lattice motion sets in on a longer time scale and causes a further decrease in the CDW order even after the laser irradiation.