The physics of quantum materials is dictated by many-body interactions and mathematical
concepts such as symmetry and topology that have transformed our understanding of matter …

The last decade witnessed significant progress in angle-resolved photoemission
spectroscopy (ARPES) and its applications. Today, ARPES experiments with 2-meV energy …

We present an experimental review of the nature of the pseudogap in the cuprate
superconductors. Evidence from various experimental techniques points to a common …

This review presents recent developments in the understanding of how impurities influence
the electronic states in the bulk properties of superconductors. The focus is on …

Tunneling spectroscopy has played a central role in the experimental verification of the
microscopic theory of superconductivity in classical superconductors. Initial attempts to apply …

Superconducting gap anisotropy at least an order of magnitude larger than that of the
conventional superconductors has been observed in the ab plane of Bi 2 Sr 2 CaCu 2 O 8+ …

Understanding the role of competing states in the cuprates is essential for developing a
theory for high-temperature superconductivity. We report angle-resolved photoemission …

We review recent experimental and theoretical results on the interaction between single-
particle excitations and collective spin excitations in the superconducting state of high-Tc …

A quantitative analysis of a recent model of high-temperature superconductors based on an
interlayer tunneling mechanism is presented. This model can account well for the observed …

The Van Hove singularity (VHS) provides a paradigm for the study of the role of peaks in the
density of states (dos) on electronic properties. More importantly, it appears to play a major …