论文标题
相关绝缘子中的电驱动绝缘体到金属过渡：电子机制和热描述
Electrically driven insulator-to-metal transition in a correlated insulator: Electronic mechanism and thermal description
论文作者
论文摘要
由电压偏置引起的过渡金属氧化物（TMO）的电阻转换的驱动，我们研究了电场驱动的强型强相关模型的远距离平衡动力学，具有平衡时以平衡为单位的一阶绝缘体到金属的过渡，也就是dimer--荷 - 荷兰模型。我们使用动态簇近似的非平衡实现来访问稳态光谱和传输属性。我们表明，电场可以驱动金属对绝缘体和绝缘体对金属的过渡。尽管它们以完全不同的机制进行，特别是在相关电荷差距中对金属与非平衡效应的简单加热，但我们表明，一旦以有效的温度计算激发，就可以在单个框架中统一这两种非平衡过渡。这种概念上的进步汇集了关于TMO中电动电阻开关的起源的长期辩论的两个方面。
Motivated by the resistive switchings in transition-metal oxides (TMOs) induced by a voltage bias, we study the far-from-equilibrium dynamics of an electric-field-driven strongly-correlated model featuring a first-order insulator-to-metal transition at equilibrium, namely the dimer-Hubbard model. We use a non-equilibrium implementation of the dynamical cluster approximation to access the steady-state spectral and transport properties. We show that the electric field can drive both metal-to-insulator and insulator-to-metal transitions. While they proceed by quite distinct mechanisms, specifically simple heating of the metal versus non-equilibrium effects in the correlated charge gap, we show that both of these non-equilibrium transitions can be unified in a single framework once the excitations are accounted for in terms of an effective temperature. This conceptual advance brings together the two sides of the long-lasting debate over the origins of the electrically-driven resistive switching in TMOs.
