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arXiv 1805.09486cond-mat.str-el
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能带和莫特绝缘体泵浦-探测光谱中的超快瞬态干涉

Ultrafast transient interference in pump-probe spectroscopy of band and Mott insulators

Kazuya Shinjo, Takami Tohyama

摘要:

超快抽运-探测光谱学具有高的时间和光谱分辨率,为研究超快非平衡现象提供了新的视角。我们提出,泵浦和探测脉冲之间的瞬态干涉实现了带和莫特绝缘体的泵浦-探测光谱,这只能在最近的超快光谱技术的发展,可以观察到。发现带绝缘体激发光谱中的连续结构作为存储泵浦脉冲光谱信息的介质,探测脉冲探测到的光谱受到该介质的干扰,产生能量域的瞬态干涉。我们还演示了一维半满哈伯德模型中电子关联存在时的瞬态干涉。此外,耦合到电子的玻色子也对干涉有贡献。我们的发现将提供一个解释的探测能量依赖的振荡最近观察到的泵浦-探测光谱的二维莫特绝缘体。

英文摘要:

Ultrafast pump-probe spectroscopy with high temporal and spectral resolutions provides new insight into ultrafast nonequilibrium phenomena. We propose that transient interference between pump and probe pulses is realized in pump-probe spectroscopy of band and Mott insulators, which can be observed only after recent developments of ultrafast spectroscopic techniques. A continuum structure in the excitation spectrum of band insulators is found to act as a medium for storing the spectral information of the pump pulse, and the spectrum detected by the probe pulse is interfered with by the medium, generating the transient interference in the energy domain. We also demonstrate the transient interference in the presence of electron correlations in a one-dimensional half-filled Hubbard model. Furthermore, bosons coupled to electrons additively contribute to the interference. Our finding will provide an interpretation of probe-energy-dependent oscillations recently observed in the pump-probe spectrum for a two-dimensional Mott insulator.

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