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arXiv 2202.04322cond-mat.str-el
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强太赫兹脉冲激发下一维莫特绝缘体的玻璃化动力学

Glassy dynamics of the one-dimensional Mott insulator excited by a strong terahertz pulse

Kazuya Shinjo, Shigetoshi Sota, Takami Tohyama

摘要:

强关联系统非平衡态的阐明是新量子相出现的关键。非平衡诱导的绝缘体到金属的转变特别有趣,因为它反映了电荷自由度的巡回性和局部化之间竞争的基本本质。研究了半满一维扩展哈伯德模型的脉冲激发绝缘体-金属跃迁。用含时密度矩阵重整化群计算了含时电导率,发现即使引入大量载流子$Δn_\text{d}$,诱导量子隧穿的强单周期和半周期脉冲也会强烈抑制对Drude权重$σ_\text{D}$有贡献的光谱权重.这与由光子吸收和化学掺杂诱导的$σ_\text{D}\propto Δn_\text{d}$的金属行为相反。量子隧穿过程中$σ_\text{D}$的强抑制是希尔伯特空间碎裂的结果,它使脉冲激发态成为玻璃态。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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