Spectral function of highly-correlated electron systems

现代固体物理学的前沿在于理解具有强关联电子系统的材料的电子性质。这些系统中的价电子自组织成新的基态，与传统的金属和绝缘体有很大的不同。在d-和f-金属系统中，强的电子关联敏感地依赖于结构、维度和化学或磁性有序。它产生了各种各样的壮观现象，包括重费米子行为、高温超导、Peierls不稳定性和金属-绝缘体相变。为了研究与频率和动量相关的谱函数中的反常现象，我们将发展一种关联材料的微观量子理论方法。我们将使用动力学平均场理论结合第一性原理电子结构方法来分析电子关联、结构无序和表面效应对过渡金属和稀土化合物光谱函数的影响。

The frontier of modern solid state physics lies today in understanding the electronic properties of materials with strongly correlated electron systems. The valence electrons in these systems self-organize into novel ground states which are substantially different from conventional metals and insulators. Strong electron correlation in d- and f-metal systems depends sensitively on the structure, dimensionality, and chemical or magnetic ordering. It gives rise to a large variety of spectacular phenomena, including heavy-fermion behavior, high-temperature superconductivity, Peierls instabilities, and metal-insulator transitions. We will develop a microscopic quantum theoretical approach to correlated materials in order to investigate anomalies in the frequency and momentum dependent spectral functions. We will use dynamical mean-field theory combined with first-principles electronic structure methods to analyze the influence of electron correlations, structural disorder, and surface effects on the spectral function of transition metal and rare-earth compounds.