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A Bose-Einstein condensate is the ground state of a dilute gas of bosons,such as atoms cooled to temperatures close to absolute zero. With much smallermass, excitons (bound electron-hole pairs) are expected to condense atsignificantly higher temperatures. Here we study electrically generatedinterlayer excitons in MoSe2/WSe2 atomic double layers with density up to 10^12cm-2. The interlayer tunneling current depends only on exciton density,indicative of correlated electron-hole pair tunneling. Strongelectroluminescence (EL) arises when a hole tunnels from WSe2 to recombine withelectron in MoSe2. We observe a critical threshold dependence of the ELintensity on exciton density, accompanied by a super-Poissonian photonstatistics near threshold, and a large EL enhancement peaked narrowly at equalelectron-hole densities. The phenomenon persists above 100 K, which isconsistent with the predicted critical condensation temperature. Our studyprovides compelling evidence for interlayer exciton condensation intwo-dimensional atomic double layers and opens up exciting opportunities forexploring condensate-based optoelectronics and exciton-mediatedhigh-temperature superconductivity.

Evidence of high-temperature exciton condensation in 2D atomic double layers