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Physicists have long debated whether the 'hidden order' in URu2Si2 is itinerant or localized, and it remains inaccessible to direct external probes. The observation of an overdamped collective mode seems to resolve this outstanding issue.
The first, long-sought evidence for the production of single top quarks, by the weak interaction, has been reported from a sophisticated analysis of a large number of proton–antiproton collisions at the Tevatron.
How shock waves travel through a superfluid provides clues to understanding the deeper nature of Bose–Einstein condensation. An optical analogue that behaves as a pure superfluid could tell us what these clues mean.
Experimental evidence for discontinuous behaviour of the magnetization suggests that ferromagnetic transitions at very low temperatures are different from their high-temperature brethren, for which the phase transitions are usually continuous.
The ability to distinguish the high-harmonic emission generated by individual half-cycles of a driving laser leads to a simpler approach to characterizing the laser pulse and isolating a single attosecond pulse.
Traditionally, complex networks are classified on the basis of their global properties. But taking into account the modular structure of the network leads to a better understanding of how the underlying systems work.
