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 …

As high-quality single-crystal materials used in electronic devices approach the microscale
and nanoscale, charge-transport phenomena in these devices result in inhomogeneous …

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 …

Active crystals are highly ordered structures that emerge from the self-organization of motile
objects, and have been widely studied in synthetic, and bacterial, active matter. Whether …

Generic interacting many-body quantum systems are believed to behave as classical fluids
on long time and length scales. Due to rapid progress in growing exceptionally pure crystals …

An electrical conductor subjected to a magnetic field exhibits the Hall effect in the presence
of current flow. Here, we report a qualitative deviation from the standard behavior in electron …

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 …

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 …

In simple fluids, such as water, invariance under parity and time-reversal symmetry imposes
that the rotation of constituent 'atoms' is determined by the flow and that viscous stresses …