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This colloquium talk by Kin Fai Mak from Cornell University explores the fascinating potential of exciton condensation at high temperatures. Discover how excitons—composite bosons formed from bound electron-hole pairs in semiconductors—could potentially achieve Bose-condensation at much higher temperatures than atomic systems due to their smaller mass. The presentation focuses on recent research efforts to create high-density equilibrium exciton fluids in atomic double layers made of two-dimensional semiconductors. Learn about thermodynamics and transport measurements that demonstrate the emergence of a high-temperature excitonic insulating state. The talk also touches on the physics of doped excitonic insulators supporting Bose-Fermi mixtures and equilibrium trion fluids. Mak's research group investigates novel physical phenomena in atomically thin materials and their heterostructures, working with diverse materials including semiconductors, superconductors, and magnets to develop new electronics and opto-mechanical devices while pushing the boundaries of what can be observed and accomplished in the two-dimensional realm.
