论文标题
强烈的Terahertz脉冲激发的一维莫特绝缘子的玻璃动力学
Glassy dynamics of the one-dimensional Mott insulator excited by a strong terahertz pulse
论文作者
论文摘要
在密切相关的系统中，阐明非平衡状态是新型量子相出现的关键。非平衡诱导的绝缘体到金属过渡特别有趣，因为它反映了案件和自由度电荷程度的定位之间竞争的基本性质。我们研究了半填充一维延长的哈伯德模型的脉冲激发的绝缘体到金属过渡。通过时间依赖时间密度 - 矩阵恢复归一化组计算时间依赖性的光电性，我们发现，诱导量子隧穿的强大的单周期和半循环脉冲强烈抑制频谱重量，这些频谱重量有助于$σ_\ text {d} $，即使我们引入了大量的Carriers $δn_pextsect $Δn_pextsect $δN_c。这与$σ_\ text {d} \ proptoΔn_\ text {d} $的金属行为形成对比。量子隧道中对$σ_\ text {d} $的强抑制是希尔伯特空间碎片的出现的结果，这使得脉冲激发的状态玻璃。
The elucidation of nonequilibrium states in strongly correlated systems holds the key to emergence of novel quantum phases. The nonequilibrium-induced insulator-to-metal transition is particularly interesting since it reflects the fundamental nature of competition between itinerancy and localization of the charge degrees of freedom. We investigate pulse-excited insulator-to-metal transition of the half-filled one-dimensional extended Hubbard model. Calculating the time-dependent optical conductivity with the time-dependent density-matrix renormalization group, we find that strong mono- and half-cycle pulses inducing quantum tunneling strongly suppress spectral weights contributing to the Drude weight $σ_\text{D}$, even if we introduce a large number of carriers $Δn_\text{d}$. This is in contrast to a metallic behavior of $σ_\text{D}\propto Δn_\text{d}$ induced by photon absorption and chemical doping. The strong suppression of $σ_\text{D}$ in quantum tunneling is a result of the emergence of the Hilbert-space fragmentation, which makes pulse-excited states glassy.
