In 1929 Edwin Hubble discovered that our Universe is expanding. Eighty years later, the Space Telescope that bears his name is being used to study an even more surprising phenomenon: that the expansion is speeding up. The origin of this effect is not known, but is broadly attributed to a ...
Excitons are composite bosons made of bound electron-hole pairs in semiconductors. With a much smaller mass than atoms, they are expected to Bose-condense at much higher temperature scales. This is especially the case for the tightly bound excitons in two-dimensional (2D) semiconductors; theoretical studies have predicted the possibility of realizing ...
