In traditional metals, the temperature (T) dependence of electrical resistivity vanishes at low
or high T, albeit for different reasons. Here, we review a class of materials, known as …

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 …

Flat-band materials such as the kagome metals or moiré superlattices are of intense current
interest. Flat bands can result from the electron motion on numerous (special) lattices and …

The appearance of the Planckian time τ Pl= ℏ/k BT is reviewed in both conventional and
unconventional metals. A pedagogical discussion of the various different timescales …

The flat bands of magic-angle twisted bilayer graphene (MATBG) host strongly correlated
electronic phases such as correlated insulators,,,–, superconductors,,,–and a strange metal …

The three central phenomena of cuprate (copper oxide) superconductors are linked by a
common do** level p*—at which the enigmatic pseudogap phase ends and the resistivity …

An overview of quantum phase transitions (QPTs) in metallic ferromagnets, discussing both
experimental and theoretical aspects, is given. These QPTs can be classified with respect to …

A wide range of metals exhibit anomalous electrical and thermodynamic properties when
tuned to a quantum critical point (QCP), although the origins of such strange metals have …

This review discusses instabilities of the Fermi-liquid state of conduction electrons in metals
with particular emphasis on magnetic quantum critical points. Both existing theoretical …

A relatively new class of materials has been found in which the basic assumption of Landau
Fermi-liquid theory—that at low energies the electrons in a metal should behave essentially …