Scientists develop polariton nano-laser operating at room temperature  May 20, 2019 Progress toward room temperature polariton nanolasers has been limited by the thermal instability of excitons and the inherently low-quality factors of nanocavities. An international team of researchers (South Korea, University of Pennsylvania) has produced a quantum well on the sidewall of a nanostructure semiconductor and succeeded in maintaining thermally stable excitons even at room temperature. The quantum well structure contributed to the formation of more efficient and stable exciton-polariton states than before by strengthening the coupling of exciton and light inside the nanostructure semiconductor. Their polariton nano-lasers are stable at room temperature and operate at only […]