论文标题
金属绝缘体过渡期间的瞬时电子相分离
Transient Electronic Phase Separation During Metal-Insulator Transitions
论文作者
论文摘要
从热力学分析中，我们证明，在纯物质中的金属 - 绝缘体跃迁期间，非平衡均匀状态可能不稳定，与具有某些波长的电荷密度调制，从而通过短暂的电子相分离转化为平衡相。这种阶段不稳定性是由于相对于顺序参数的第一和第二个衍生物之间的两个不等式而发生的。还得出了调制相的主要波长。计算机模拟进一步确认了理论推导。采用vo $ _2 $的预先建立的相田模型，我们表明这种瞬态电子相位可能会在PothExcitation时以VO $ _2 $进行。
From thermodynamic analysis we demonstrate that during metal-insulator transitions in pure matters, a nonequilibrium homogeneous state may be unstable against charge density modulations with certain wavelengths, and thus evolves to the equilibrium phase through transient electronic phase separation. This phase instability occurs as two inequalities between the first and the second derivatives of the free energy with respect to the order parameter are fulfilled. The dominant wavelength of the modulated phase is also derived. The computer simulation further confirms the theoretical derivation. Employing the pre-established phase-field model of VO$_2$, we show that this transient electronic phase separation may take place in VO$_2$ upon photoexcitation.
