Photoemission of a doped Mott insulator: spectral weight transfer and a qualitative Mott-Hubbard description.
Photoemission of a doped Mott insulator: spectral weight transfer and a qualitative Mott-Hubbard description.
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掺杂莫特绝缘体的光电发射：光谱权重转移和定性莫特-哈伯德描述。
DOI：
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发表时间：
2009
影响因子：
8.6
通讯作者：
R. Claessen
中科院分区：
文献类型：
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作者：
M. Sing;S. Glawion;M. Schlachter;M. Scholz;K. Goss;J. Heidler;G. Berner;R. Claessen
用光电子能谱研究了低维Mott绝缘体TiOCl在碱金属掺杂下的光谱权重演化。我们观察到较低的哈伯德带和一个额外的峰值之间的光谱重量转移后，电子掺杂，在改变单和双占据的网站的数量的原子限制的定量预期。这一观察结果是相关谱带的无条件标志，以前没有报道过。相比之下，金属准粒子峰的缺失可以追溯到简单的单粒子效应。
The spectral weight evolution of the low-dimensional Mott insulator TiOCl upon alkali-metal dosing has been studied by photoelectron spectroscopy. We observe a spectral weight transfer between the lower Hubbard band and an additional peak upon electron doping, in line with quantitative expectations in the atomic limit for changing the number of singly and doubly occupied sites. This observation is an unconditional hallmark of correlated bands and has not been reported before. In contrast, the absence of a metallic quasiparticle peak can be traced back to a simple one-particle effect.