The spectral energy gap is an important signature that defines states of quantum matter:
insulators, density waves and superconductors have very different gap structures. The …

This article gives an overview of both theoretical and experimental developments
concerning states with lattice symmetry breaking in the cuprate high-temperature …

A long-standing controversial issue in the quest to understand the superconductivity in
cuprates is the nature of the enigmatic pseudogap region of the phase diagram. Especially …

Doped Mott insulators exhibit some of the most intriguing quantum phases of matter,
including quantum spin liquids, unconventional superconductors and non-Fermi liquid …

The phase diagram of cuprate high-temperature superconductors features an enigmatic
pseudogap region that is characterized by a partial suppression of low-energy electronic …

To explore the doping dependence of the recently discovered charge-density-wave (CDW)
order in YBa 2 Cu 3 O y, we present a bulk-sensitive high-energy x-ray study for several …

The existence of electronic symmetry breaking in the underdoped cuprates and its
disappearance with increased hole density p are now widely reported. However, the relation …

Neutron scattering experiments continue to improve our knowledge of spin fluctuations in
layered cuprates, excitations that are symptomatic of the electronic correlations underlying …

The pseudogap region of the phase diagram is an important unsolved puzzle in the field of
high-transition-temperature (high-T c) superconductivity, characterized by anomalous …

Close to optimal doping, the copper oxide superconductors show 'strange metal'behaviour,,
suggestive of strong fluctuations associated with a quantum critical point,,,. Such a critical …