Observation of interband Berry phase in laser-driven crystals.

Ever since its discovery, the notion of the Berry phase has permeated all branches of physics and plays an important part in a variety of quantum phenomena. However, so far all its realizations have been based on a continuous evolution of the quantum state, following a cyclic path. Here we introduce and demonstrate a conceptually new manifestation of the Berry phase in light-driven crystals, in which the electronic wavefunction accumulates a geometric phase during a discrete evolution between different bands, while preserving the coherence of the process.

Revealing the Interplay between Strong Field Selection Rules and Crystal Symmetries.

Symmetries are ubiquitous in condensed matter physics, playing an important role in the appearance of different phases of matter. Nonlinear light matter interactions serve as a coherent probe for resolving symmetries and symmetry breaking via their link to selection rules of the interaction. In the extreme nonlinear regime, high harmonic generation (HHG) spectroscopy offers a unique spectroscopic approach to study this link, probing the crystal spatial properties with high sensitivity while opening new paths for selection rules in the XUV regime.

Investigating the Impact of Food Rewards on Children's Motivation to Participate in Sport.

Children who are physically active and involved in organized sport report having the unhealthiest diets. Research suggests excessive calories may be attributed to the prevalence of fast food and candy which are often provided as rewards in sport. This study explored the use of food as a reward in youth sport and the perceived impact it has on children's motivation to participate in recreational soccer and ice hockey.

Association of daily and time-segmented physical activity and sedentary behaviour with mental health of school children and adolescents from rural Northeastern Ontario, Canada.

Physical activity (PA) and sedentary behaviour (SED) have been linked to the mental health of children and adolescents, yet the timing of behaviours may play a role in this relationship and clarifying this could inform interventions. We explored cross-sectional associations of PA and SED in varying time segments throughout the school day with the mental health of school-aged children and adolescents from rural Northeastern Ontario, Canada. A total of 161 students (56% female, M = 10.

Impact of COVID-19 School-Related Policies in Ontario on Parents' School Lunch Packing Habits.

COVID-19 has disrupted the daily routines of many Canadian families. In Ontario, provincially mandated public health measures have resulted in significant changes to school policies, including those related to food. The impact of COVID-19 related school food policies on parental lunch packing habits is unknown; therefore, this study investigated how school-related COVID-19 policies have impacted parental school lunch packing habits.