论文标题
激光诱导的超快绝缘子 - 金属过渡$ \ text {babio} _ {3} $
Laser-induced ultrafast insulator-metal transition in $\text{BaBiO}_{3}$
论文作者
论文摘要
我们研究了由强激光脉冲驱动的未凝固$ \ text {babio} _ {3} $的超快速相干量子动力学。我们的计算表明，在广泛的辐射频率和强度中，系统经历了从绝缘态到金属状态的瞬时变化，在该金属状态下，电荷密度波和相应的能谱间隙消失。过渡发生在数十个飞秒的超快速时间尺度上，与相应的晶格振动的周期相当。动力学是由粒子孔激发在间隙和隧道中的复杂相互作用确定的，从而产生了高度非平凡的时间演化，该演变包括高谐波，并揭示了间隙的周期性重新出现。通过用系统和辐射的逼真的参数求解动态平均场理论方程来获得时间演化。结果总结在相图中，有助于可能的实验设置，以实现对具有类似强的电子 - phonon相互作用的该材料的传导状态的动力控制。
We investigate ultra-fast coherent quantum dynamics of undoped $\text{BaBiO}_{3}$ driven by a strong laser pulse. Our calculations demonstrate that in a wide range of radiation frequencies and intensities the system undergoes a transient change from the insulating to the metallic state, where the charge density wave and the corresponding energy spectrum gap vanish. The transition takes place on the ultra-fast time scale of tens femtoseconds, comparable to the period of the corresponding lattice vibrations. The dynamics are determined by a complex interplay of the particle-hole excitation over the gap and of the tunnelling through it, giving rise to the highly non-trivial time evolution which comprises high harmonics and reveals periodic reappearance of the gap. The time evolution is obtained by solving the dynamical mean-field theory equations with the realistic parameters for the system and radiation. Results are summarized in the phase diagram, helpful for a possible experimental setup to achieve a dynamical control over the conduction state of this and other materials with the similarly strong electron-phonon interaction.
