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arXiv 2005.14100cond-mat.str-el
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非线性电子-声子相互作用驱动的超快Mott跃迁

Ultrafast Mott transition driven by nonlinear electron-phonon interaction

Francesco Grandi, Jiajun Li, Martin Eckstein

摘要:

非线性声子学有望在超短时间尺度上控制量子材料的性质。利用非平衡动力学平均场论,我们求解了一个描述有机固体的模型,其中关联电子非线性耦合到一个量子声子模。与以前的作品,我们完全对角化的本地声子模式内的非交叉近似,包括完整的声子波动。通过用超短脉冲在共振附近的宽频率范围内激发局域声子,我们证明了诱导莫特绝缘体-金属相变的可能性。传统的半经典和平均场计算,其中的电子-声子相互作用的重叠,低估了准粒子峰的发病。这一事实,连同非热性质的光致金属,表明了主导作用的声子的波动和动态性质的振动诱导准粒子的相干性的状态。

英文摘要:

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.

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