论文标题
光引发兴奋子绝缘子的金属化
Photoinduced metallization of excitonic insulators
论文作者
论文摘要
利用时间依赖性的密度 - 马trix重新归一化组技术，我们在数值上证明了在延伸的Falicov-kimball模型（EFKM）中的光诱导的配对状态，在半填充中，无论带有和不带有内部SU（2）对称性。在时间依赖的光发射光谱中，脉冲照射后的费米能量上方出现了一个额外的条带，表明绝缘体到金属的跃迁。即使在没有SU（2）结构的情况下，对泵期间，对的相关性也会增强，然后随着时间的推移降低。这意味着Ta $ _2 $ nise $ _5 $的可能金属化可能是激烈的绝缘材料的强大候选者，因此，EFKM被认为是最小的理论模型。使用优化的脉冲参数模拟光发射，我们演示了光诱导的量子相变，该发现与最新的时间和角度分辨光发射光谱实验在ta $ _2 $ _2 $ nise $ _5 $上进行。
Utilizing the time-dependent density-matrix renormalization group technique, we numerically prove photoinduced pairing states in the extended Falicov-Kimball model (EFKM) at half filling, both with and without internal SU(2) symmetry. In the time-dependent photoemission spectra an extra band appears above the Fermi energy after pulse irradiation, indicating an insulator-to-metal transition. Even in the absence of the SU(2) structure, the pair correlations are enhanced during the pump, and afterwards decrease over time. This implies the possible metallization of Ta$_2$NiSe$_5$, a strong candidate for an excitonic insulator material, for which the EFKM is considered to be the minimal theoretical model. Simulating the photoemission with optimized pulse parameters, we demonstrate a photoinduced quantum phase transition, in accord with recent findings in time- and angle-resolved photoemission spectroscopy experiments on Ta$_2$NiSe$_5$.
