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 …

Artificial spin ices are frustrated spin systems that can be engineered, in which fine tuning of
geometry and topology has allowed the design and characterization of exotic emergent …

Traditional electronics employs charge currents to control and transmit information and
therefore suffer from energy dissipation due to electron scattering. In the past decade, spin …

From atomic crystals to animal flocks, the emergence of order in nature is captured by the
concept of spontaneous symmetry breaking,,–. However, this cornerstone of physics is …

Artificial spin ice systems are lithographically prepared arrays of interacting nanoscale
magnetic moments with collective behavior resulting from the chosen array geometry. These …

Frustration is a ubiquitous phenomenon in many-body physics that influences the nature of
the system in a profound way with exotic emergent behavior. Despite its long research …

Frustration occurs when a system cannot find a lowest-energy configuration due to
conflicting constraints. We show that a frustrated superradiant phase transition occurs when …

Viscous flows are laminar and deterministic. Robust linear laws accurately predict their
streamlines in geometries as complex as blood vessels, porous media and pipe networks …

Phase behaviours of two-dimensional (2D) systems constitute a fundamental topic in
condensed matter and statistical physics. Although hard polygons and interactive point-like …

Novel magnetic materials are important for future technological advances. Theoretical and
numerical calculations of ground-state properties are essential in understanding these …