Nonergodicity in the Anisotropic Dicke Model.

We study the ergodic-nonergodic transition in a generalized Dicke model with independent corotating and counterrotating light-matter coupling terms. By studying level statistics, the average ratio of consecutive level spacings, and the quantum butterfly effect (out-of-time correlation) as a dynamical probe, we show that the ergodic-nonergodic transition in the Dicke model is a consequence of the proximity to the integrable limit of the model when one of the couplings is set to zero. This can be interpreted as a hint for the existence of a quantum analogue of the classical Kolmogorov-Arnold-Moser theorem.

Wireless transfer between antenna arrays at the Talbot distance.

In modern multiple input multiple output (MIMO) wireless communication systems arrays of antennas are employed to enhance the data transfer rate. Scattering of the waves in the medium between the antennas can actually enhance the transfer capacity by decorrelating the available channels. Here it is shown that the transfer capacity between arrays of regularly spaced antennas depends intricately on the distance between the arrays and on the arrangement of scatterers.

Spontaneously formed trans-anethol/water/alcohol emulsions: mechanism of formation and stability.

We studied the spontaneous emulsification and droplet growth mechanism in trans-anethol/water/ethanol solutions, also known as the beverage ouzo, using dynamic light scattering spectroscopy. This simple ternary mixture is a generic example of a system that forms microemulsions spontaneously when brought into the two-phase region. The volume fraction of the dispersed phase was found to profoundly affect the growth rates of the droplets, which is a new finding that has not been predicted by the Lifshitz-Slyozov-Wagner theory.