Quantum impurity models describe an atom or molecule embedded in a host material with
which it can exchange electrons. They are basic to nanoscience as representations of …

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 …

Spin-triplet superconductors are condensates of electron pairs with spin 1 and an odd-parity
wavefunction. An interesting manifestation of triplet pairing is the chiral p-wave state, which …

A second-order phase transition is characterized by spontaneous symmetry breaking. The
nature of the broken symmetry in the so-called “hidden-order” phase transition in the heavy …

We construct and analyze a microscopic model for insulating rocksalt ordered double
perovskites, with the chemical formula A 2 BB′ O 6, where the B′ atom has a 4 d 1 or 5 d 1 …

Within a Kondo lattice, the strong hybridization between electrons localized in real space (r-
space) and those delocalized in momentum-space (k-space) generates exotic electronic …

This topical review describes the multitude of unconventional behaviors in the hidden order,
heavy fermion, antiferromagnetic and superconducting phases of the intermetallic …

Exotic electronic states resulting from entangled spin and orbital degrees of freedom are
hallmarks of strongly correlated f-electron systems. A spectacular example is the so-called …

Heavy electronic states originating from the f atomic orbitals underlie a rich variety of
quantum phases of matter. We use atomic scale imaging and spectroscopy with the …

The development of collective long-range order by means of phase transitions occurs by the
spontaneous breaking of fundamental symmetries. Magnetism is a consequence of broken …