[Kindergarten Children's Use of Smartphones and Tablets: Associations with Social-Emotional Development and Behavioral Problems - A Scoping Review].

Young children's use of smartphones and tablets is increasingly prevalent. Smartphones and tablets are part of families' daily lives. Therefore, preschoolers are confronted with mobile devices as well, and learn to use them naturally.

Smartphones in the nursery: Parental smartphone use and parental sensitivity and responsiveness within parent-child interaction in early childhood (0-5 years): A scoping review.

The omnipresence of smartphones has not stopped at the door to the nursery. It is especially important to better understand the impact of parental smartphone use on relationships at the beginning of children's lives. Babies and toddlers are essentially dependent on caregivers' sensitive and responsive behaviors within the context of the development of attachment patterns.

Observation of forbidden exciton transitions mediated by Coulomb interactions in photoexcited semiconductor quantum wells.

We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum well sample. Monitoring the excitonic photoluminescence, we observe transient quenching of the 1s exciton emission, which we attribute to the terahertz-induced 1s-to-2p excitation. Simultaneously, a pronounced enhancement of the 2s exciton emission is observed, despite the 1s-to-2s transition being dipole forbidden.

Slow light based on stimulated Raman scattering in an integrated liquid-core optical fiber filled with CS2.

We demonstrate a fiber-based slow light system using a carbon disulfide (CS2)) filled integrated liquid-core optical fiber (i-LCOF). Using 1 meter of i-LCOF we were able to delay 18ps pulses up to 34ps; a delay of 188% of the pulse width. This experimental setup serves as a foundation for slow-light experiments in other nonlinear liquids.

Brillouin lasing in integrated liquid-core optical fibers.

We report Brillouin lasing in an integrated liquid-core optical fiber filled with neat CS. This is the first observation of Brillouin lasing in an optical fiber filled with a liquid, to the best of our knowledge. The linewidth of the single frequency liquid-based Brillouin laser was estimated to be <1 kHz by beating two similar but independent lasers against one another.