The study of nonequilibrium phenomena in correlated lattice systems has developed into
one of the most active and exciting branches of condensed matter physics. This research …

Engines are systems and devices that convert one form of energy into another, typically into
a more useful form that can perform work. In the classical setup, physical, chemical, and …

Heat engines convert thermal energy into mechanical work and generally involve a large
number of particles. We report the experimental realization of a single-atom heat engine. An …

We review the dynamics after quantum quenches in integrable quantum spin chains. We
give a pedagogical introduction to relaxation in isolated quantum systems, and discuss the …

Statistical mechanics demands that the temperature of a system is positive provided that its
internal energy has no upper bound. Yet if this condition is not met, it is possible to attain …

Lately, there has been a resurgence of interest in nonlinear multimode optical systems. The
sheer complexity emerging from the presence of a multitude of nonlinearly interacting …

Nonequilibrium interacting systems can evolve to exhibit large-scale structure and order. In
two-dimensional turbulent flow, the seemingly random swirling motion of a fluid can evolve …

Out-of-time ordered (OTO) correlation functions describe scrambling of information in
correlated quantum matter. They are of particular interest in incoherent quantum systems …

Although the temperature of a thermodynamic system is usually believed to be a positive
quantity, under particular conditions, negative-temperature equilibrium states are also …

We review the general aspects of the concept of temperature in equilibrium and non-
equilibrium statistical mechanics. Although temperature is an old and well-established …