@article{aa30bf825c7a49fbb740895144859a5e,
title = "Direct observation of multiple conduction-band minima in high-performance thermoelectric SnSe",
abstract = "We report time- and angle-resolved photoemission spectroscopy on SnSe which currently attracts great interest due to its extremely high thermoelectric performance. Laser-assisted photoemission signals are observed within ±20 fs of the pump pulse arrival. Around 30–50 fs after the photoexcitation, the conduction band minima are not populated by the photoexcited electrons while the valence bands are considerably broadened. In going from 90 fs to 550 fs after the photoexcitation, the photoexcited carriers are decayed into the multiple conduction band minima. The observed conduction bands are consistent with the band structure calculations. The multiple conduction minima suggest possibility of high and anisotropic thermoelectric performance of n-type SnSe single crystal if it is realized.",
keywords = "Angle-resolved photoemission sepctroscopy (ARPES), Dynamic phenomena, Electronic structure, Semiconductor, Thermoelectric materials",
author = "Mario Okawa and Yuka Akabane and Mizuki Maeda and Gangjian Tan and Zhao, {Li Dong} and Kanatzidis, {Mercouri G.} and Takeshi Suzuki and Mari Watanabe and Jiadi Xu and Qianhui Ren and Masami Fujisawa and Teruto Kanai and Jiro Itatani and Shik Shin and Kozo Okazaki and Saini, {Naurang L.} and Takashi Mizokawa",
note = "Funding Information: At Tokyo, this work was supported by the Grants-in-Aid from the Japan Society for the Promotion of Science (JSPS) (No. 19H00659). At Argonne, this work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (materials synthesis). This work was carried out under the Visiting Researcher{\textquoteright}s Program of Institute for Solid State Physics, University of Tokyo (Proposal No. B219). Funding Information: At Tokyo, this work was supported by the Grants-in-Aid from the Japan Society for the Promotion of Science (JSPS) (No. 19H00659). At Argonne, this work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (materials synthesis). This work was carried out under the Visiting Researcher's Program of Institute for Solid State Physics, University of Tokyo (Proposal No. B219). Publisher Copyright: {\textcopyright} 2022 Acta Materialia Inc.",
year = "2023",
month = jan,
day = "15",
doi = "10.1016/j.scriptamat.2022.115081",
language = "English",
volume = "223",
journal = "Scripta Materialia",
issn = "1359-6462",
publisher = "Elsevier Limited",
}