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    Dark Excitons hit the spotlight

    December 6, 2020, Categories  Physics, Technology/Electronics

    The instrument used an initial pump pulse of light to excite electrons and generate excitons. This was rapidly followed by a second pulse of light that used extreme ultraviolet photons to kick the electrons within excitons out of the material and into the vacuum of an electron microscope. The electron microscope then measured the energy and angle that the electrons left the material.

    Heralding the end of a decade-long quest, in a promising new class of extremely thin, two-dimensional semiconductors, scientists have for the first time directly visualized and measured elusive particles, called dark excitons, that cannot be seen by light.

    The powerful technique, described in leading journal Science, could revolutionize research into two-dimensional semiconductors and excitons, with pro...

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