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Femtosecond pump–probe studies of phonons and carriers in bismuth under high pressure

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Title: Femtosecond pump–probe studies of phonons and carriers in bismuth under high pressure
Authors: Kasami, M. Browse this author
Ogino, T. Browse this author
Mishina, T. Browse this author
Yamamoto, S. Browse this author →KAKEN DB
Nakahara, J.5 Browse this author →KAKEN DB
Authors(alt): 中原, 純一郎5
Keywords: coherent phonon
photo-excited carrier
high pressure
Issue Date: Jul-2006
Publisher: Elsevier
Journal Title: Journal of Luminescence
Volume: 119
Start Page: 428
End Page: 432
Publisher DOI: 10.1016/j.jlumin.2006.01.028
Abstract: We investigate the high-pressure phase of Bi under hydrostatic pressure using pump-probe spectroscopy at pressures up to 3.0 GPa, and we observe coherent phonons signal and relaxation signal of photo-excited carriers at Bi(II) and Bi(III) phases. The pressure dependence of the coherent phonons shows that the amplitude of coherent phonons is extremely small and the frequency of coherent phonons changes at high-pressure phases. As results from our experiment, we obtain its frequencies are 2.5 and 2.2 THz at Bi(II) and Bi(III), respectively. Furthermore, photo-excited carrier relaxation indicates drastic changes near 2.5 GPa. Bismuth transforms from semimetal to semiconductor near 2.5 GPa, and band-overlapping between at L-point and at T-point disappears. We consider that the drastic changes of the photo-excited carrier relaxation are strongly correlated with the band-overlapping disappearing.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中原 純一郎

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