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An ultracold quantum gas experiment shows that, when it crosses the many-body phase transition, the original ground state can evolve coherently into the new emergent phase, reflecting the initial global coherence presented in the system.
Taking into account the spatial distribution of population and its mobility, a reaction–diffusion model of an epidemic process reveals several different critical regimes, in which human mobility may even be detrimental to the spread of the disease.
Non-equilibrium signatures of topology—the appearance, movement and annihilation of vortices in a cold-atom system—are identified, showing that topological phase can emerge dynamically from a non-topological state.
Photon correlation measurements in driven-dissipative systems reveal the dynamical properties of dissipative phase transitions, as shown for optical bistability of cavity polaritons in GaAs.
Exploiting the magnetic field-induced shift of entropy in certain molecular salts when going from 1D short-range ordering to a 3D quantum critical point could provide a route for producing strongly fluctuating quantum materials.
Nanomagnets are often used to build artificial systems that are geometrically frustrated, but when quasiperiodic ordering is introduced, an unusual ground state can form, with an ordered skeletal structure surrounding groups of degenerate macrospins.
Theory and experiment show that quantum correlations violate the instrumental test—a common statistical method used to estimate the strength of causal relationships between two variables.
The topological valley Hall effect was predicted as a consequence of the bulk topology of electronic systems. Now it has been observed in photonic crystals, showing that both topology and valley are innate to classical as well as quantum systems.
The effect of blackbody radiation is expected to be very weak. The acceleration due to the attractive optical forces from blackbody radiation is measured in an atom interferometer and, surprisingly, it dominates gravity and radiation pressure