In the last two decades non-equilibrium spectroscopies have evolved from avant-garde
studies to crucial tools for expanding our understanding of the physics of strongly correlated …

Recent studies of the electromagnetic response of high-T c superconductors using terahertz,
infrared, and optical spectroscopies are reviewed. In combination these experimental …

We present an experimental review of the nature of the pseudogap in the cuprate
superconductors. Evidence from various experimental techniques points to a common …

Inelastic light scattering is an intensively used tool in the study of electronic properties of
solids. Triggered by the discovery of high-temperature superconductivity in the cuprates and …

We present tunneling spectroscopy of Bi 2 Sr 2 CaCu 2 O 8+ δ single crystals as a function
of oxygen doping and temperature. The doping dependence amounts essentially to an …

Photoexcited quasiparticle relaxation dynamics are investigated in a YBa 2 Cu 3 O 7− δ
superconductor as a function of doping δ and temperature T using ultrafast time-resolved …

The gap structure in Y 1− x Ca x Ba 2 Cu 3 O 7− δ single crystals is investigated by real-time
measurements of the quasiparticle (QP) relaxation dynamics with femtosecond optical …

The 'pseudogap'observed in the electron excitation spectrum of underdoped copper oxide
superconductors has become the focus of considerable attention in the field of high …

This review is an up-to-date snapshot of the current situation in studies of materials with
competing electron spectrum instabilities, namely Cooper pairing, on the one hand, and …

An overview of one-and two-dimensional quantum spin systems based on transition-metal
oxides and halides of current interest is given, such as spin-Peierls, spin-dimer …