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Although spin fluctuations are believed to have an important role in the mechanism responsible for high-temperature superconductivity, it has been unclear whether the strength of their coupling with fermionic quasiparticles is sufficiently strong. Systematic analysis of angle-resolved photoemission and neutron spectra suggests it is.
Two intriguing shapes that appear in Bose–Einstein condensates are vortex rings and solitons. Experiments now suggest that there can be periodic oscillations between these qualitatively different structures.
When two single Rydberg atoms—those with electrons in highly excited states—interact, one can be used to control the quantum state of the other. Two independent experiments demonstrate such ‘Rydberg blockade’, an effect that might make long-range quantum gates between neutral atoms possible.
When two single Rydberg atoms—those having electrons in highly excited states—interact, one can be used to control the quantum state of the other. Two independent experiments now demonstrate a ‘Rydberg blockade’, an effect that might make long-range quantum gates between neutral atoms possible.
A systematic demonstration of the generation and focusing of laser-driven high-order harmonics to a near-diffraction-limited spot suggests that scaling this approach to ever higher intensities could be easier than first thought.
The force between molecules deposited on a surface during the growth of an organic film is usually attractive. But for certain metal phthalocyanine molecules, this force can change with temperature from attractive to repulsive, resulting in unusual ordering behaviour.