Room temperature 1D excitonic guides

The emerging field of excitonics, made possible by the remarkable advancement in material science and nanofabrication, presents the possibility of improving on the usual on-chip interconnect paradigm of using electrons. In this work, we report a room temperature 1D excitonic guide in tungsten diselenide (WSe₂) monolayer, where photo generated excitons drift under a gradient in the exciton potential. The excitonic potential energy gradient is created by engineering the band structure along the guide using underlying nanostructures. [1] We achieve drift length in excess of 2.5 μm with 60.8 % efficiency and exciton drift velocity reaching ~8 × 10⁵ cm²/s. [2] In addition, we observe fluence dependent excitonic drift suggesting contributions from nonequilibrium many-body effects. [3] These results are critical for realizing optoexcitonic circuits: a next generation ultrafast and efficient data communication and processing platform.