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Transient electron-hole pairs generated in semiconductors can exhibitunconventional excitonic condensation. Anisotropy in the carrier mass isconsidered as the key to elongate the life time of the pairs, and hence tostabilize the condensation. Here we employ time- and angle-resolvedphotoemission spectroscopy to explore the dynamics of photo-generated carriersin black phosphorus. The electronic structure above the Fermi level has beensuccessfully observed, and a massive-and-anisotropic Dirac-type dispersions areconfirmed; more importantly, we directly observe that the photo-carriersgenerated across the direct band gap have the life time exceeding 400 ps. Ourfinding confirms that black phosphorus is a suitable platform for excitoniccondensations, and also open an avenue for future applications in broadbandmid-infrared BP-based optoelectronic devices.

Prolonged photo-carriers generated in a massive-and-anisotropic Dirac material