Excitons in the fractional quantum Hall effect.

Excitons, Coulomb-driven bound states of electrons and holes, are typically composed of integer charges. However, in bilayer systems influenced by charge fractionalization, a more interesting form of interlayer exciton can emerge, in which pairing occurs between constituents that carry fractional charges. Despite numerous theoretical predictions for these fractional excitons, their experimental observation has remained unexplored.

Demographic and clinical factors associated with functional changes in Long-Covid.

Many people experience symptoms months or years following COVID-19 infection. The impact of these symptoms on daily functioning and factors associated with functional decline are not well understood. This study aimed to describe functional changes among persons with Long-Covid and explore associated sociodemographic and clinical factors.