This Colloquium reviews the 25 year quest to understand the continuous (second-order),
mean-field-like phase transition occurring at 17.5 K in URu 2 Si 2. About ten years ago, the …

Angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy
(STM) have become indispensable tools in the study of correlated quantum materials. Both …

As an exemplary Kondo insulator, SmB 6 has been studied for several decades. However,
direct evidence for the development of the Kondo coherent state and for the evolution of the …

In solids containing elements with f orbitals, the interaction between f-electron spins and
those of itinerant electrons leads to the development of low-energy fermionic excitations with …

The entanglement of quantum states is both a central concept in fundamental physics and a
potential tool for realizing advanced materials and applications. The quantum …

This article overviews the development of heavy-fermion superconductivity, notably in such
rare-earth-based intermetallic compounds which behave as Kondo-lattice systems. Heavy …

Hybridization between conduction electrons and the strongly interacting f-electrons in rare
earth or actinide compounds may result in new states of matter. Depending on the exact …

The nature of the second-order phase transition that occurs in URu 2 Si 2 at 17.5 K remains
puzzling despite intensive research. A key question emerging in the field is whether a …

Resolving the heavy fermion band in the conduction electron momentum resolved spectral
function of the Kondo lattice model is challenging since, in the weak coupling limit, its …

Samarium hexaboride (SmB6), a well-known Kondo insulator in which the insulating bulk
arises from strong electron correlations, has recently attracted great attention owing to …