论文标题
非线性电子 - phonon相互作用驱动的超快莫特过渡
Ultrafast Mott transition driven by nonlinear electron-phonon interaction
论文作者
论文摘要
非线性语音有望控制量子材料在超短时间尺度上的性质。使用非平衡动力学平均场理论，我们解决了一个模型来描述有机固体，其中将电子与量子模式非线相关。与以前的作品不同，我们完全将非交叉近似局部声子模式对角线化，以包括完整的声音波动。通过在与超短脉冲共振附近的广泛频率中激发局部声子，我们表明有可能诱导Mott绝缘体到金属相变。传统的半古典和平均场计算，其中电子相互作用是脱离了准粒子峰的发作。这一事实与光诱导的金属的非热特性一起表明了语音波动的领先作用以及状态在振动诱导的准粒子相干性中的动态性质。
Nonlinear phononics holds the promise for controlling properties of quantum materials on the ultrashort timescale. Using nonequilibrium dynamical mean-field theory, we solve a model for the description of organic solids, where correlated electrons couple nonlinearly to a quantum phonon mode. Unlike previous works, we exactly diagonalize the local phonon mode within the noncrossing approximation to include the full phononic fluctuations. By exciting the local phonon in a broad range of frequencies near resonance with an ultrashort pulse, we show it is possible to induce a Mott insulator-to-metal phase transition. Conventional semiclassical and mean-field calculations, where the electron-phonon interaction decouples, underestimate the onset of the quasiparticle peak. This fact, together with the nonthermal character of the photoinduced metal, suggests a leading role of the phononic fluctuations and of the dynamic nature of the state in the vibrationally induced quasiparticle coherence.
