Enhancement of the Electron–Hole BCS Order by Energy Band Anisotropy in Highly Photoexcited Semiconductors

Mizoo, Kazumasa; Inagaki, Takeshi; Ueshima, Yutaka; Aihara, Masaki

doi:10.1143/jpsj.75.044401

Cited by 2 publications

(2 citation statements)

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“…The significant feature of excitonic insulating state is still lacking in the present study probably because of the insufficient temperature i.e. the predicted critical temperature is typically lower than 1K [10][11] and the larger probe energy i.e. the probe wavelength is better to match the band gap energy.…”

Section: Discussionmentioning

confidence: 78%

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

Nurmamat

Ishida

Yori

et al. 2018

Sci Rep

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Transient electron-hole pairs generated in semiconductors can exhibit unconventional excitonic condensation. Anisotropy in the carrier mass is considered as the key to elongate the life time of the pairs, and hence to stabilize the condensation. Here we employ time- and angle-resolved photoemission spectroscopy to explore the dynamics of photo-generated carriers in black phosphorus. The electronic structure above the Fermi level has been successfully observed, and a massive-and-anisotropic Dirac-type dispersions are confirmed; more importantly, we directly observe that the photo-carriers generated across the direct band gap have the life time exceeding 400 ps. Our finding confirms that black phosphorus is a suitable platform for excitonic condensations, and also open an avenue for future applications in broadband mid-infrared BP-based optoelectronic devices.

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Section: Discussionmentioning

confidence: 78%

“…Recently, it is theoretically suggested that e-h BCS order can be enhanced when the effective masses of electrons and holes have a strong anisotropy [10][11]. Besides, the photo-induced superconductivity has also been predicted in a laser-driven two-band semiconductor [12].…”

Section: Introductionmentioning

confidence: 99%