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 structures, the phase diagrams, and the appearance of a neutron resonance signaling
an unconventional superconducting state provide phenomenological evidence relating the …

Kamihara and coworkers' report of superconductivity at T c= 26 K in fluorine-doped
LaFeAsO inspired a worldwide effort to understand the nature of the superconductivity in this …

High-transition temperature (high-T c) superconductivity in the iron pnictides or
chalcogenides emerges from the suppression of the static antiferromagnetic order in their …

We present a field-theoretic renormalization group analysis of Abanov and Chubukov's
model of the spin density wave transition in two dimensional metals. We identify the …

Starting from a microscopic itinerant model, we derive and analyze the effective low-energy
model for collective magnetic excitations in the iron pnictides. We show that the stripe …

The nature of the tetragonal-to-orthorhombic structural transition at T s≈ 90 K in single
crystalline FeSe is studied using shear-modulus, heat-capacity, magnetization, and nuclear …

We demonstrate that the changes in the elastic properties of the FeAs systems, as seen in
our resonant ultrasound spectroscopy data, can be naturally understood in terms of …

The coupling between superconductivity and orthorhombic distortion is studied in vapor-
grown FeSe single crystals using high-resolution thermal-expansion measurements. In …

We investigate the electronic reconstruction across the tetragonal-orthorhombic structural
transition in FeSe by employing polarization-dependent angle-resolved photoemission …