Elasticity typically refers to a material's ability to store energy, whereas viscosity refers to a
material's tendency to dissipate it. In this review, we discuss fluids and solids for which this is …

In active matter systems, individual constituents convert energy into non-conservative forces
or motion at the microscale, leading to morphological features and transport properties that …

Out of equilibrium, a lack of reciprocity is the rule rather than the exception. Non-reciprocity
occurs, for instance, in active matter,,,,–, non-equilibrium systems,–, networks of neurons …

Over the past two decades, complex network theory provided the ideal framework for
investigating the intimate relationships between the topological properties characterizing the …

Ferrofluids investigated along for about five decades are ultrastable colloidal suspensions of
magnetic nanoparticles, which manifest simultaneously fluid and magnetic properties. Their …

A passive solid cannot do work on its surroundings through any quasistatic cycle of
deformations. This property places strong constraints on the allowed elastic moduli. In this …

Active materials are characterized by continuous injection of energy at the microscopic level
and typically cannot be adequately described by equilibrium thermodynamics. Here we …

Synchronization occurs in many natural and technological systems, from cardiac pacemaker
cells to coupled lasers. In the synchronized state, the individual cells or lasers coordinate the …

We study the hydrodynamics of fluids composed of self-spinning objects such as chiral
grains or colloidal particles subject to torques. These chiral active fluids break both parity …

Self-assembly is the autonomous organization of components into patterns or structures: an
essential ingredient of biology and a desired route to complex organization. At equilibrium …