タイトル |
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Femtosecond pump–probe studies of phonons and carriers in bismuth under high pressure
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作成者 |
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アクセス権 |
open access |
主題 |
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coherent phonon
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photo-excited carrier
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bismuth
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high pressure
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band-overlapping
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NDC
425
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内容注記 |
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Abstract
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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.
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出版者 |
en
Elsevier
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日付 |
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言語 |
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資源タイプ |
journal article |
出版タイプ |
AM |
資源識別子 |
HDL
http://hdl.handle.net/2115/14424
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関連 |
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URI
http://www.sciencedirect.com/science/journal/00222313
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isVersionOf
DOI
https://doi.org/10.1016/j.jlumin.2006.01.028
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収録誌情報 |
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Journal of Luminescence
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巻119
開始ページ428
終了ページ432
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ファイル |
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コンテンツ更新日時 |
2023-07-26 |