絞り込み

16555

広告

駿府城跡から豊臣秀吉が築かせた石垣跡 一般公開 (NHK)

徳川家康が築いた静岡市にある駿府城の天守台跡付近から、当時、ライバル関係にあった豊臣秀吉が築かせた石垣跡が見つかり、20日、一般公開されました。 静岡市によりま...

  1. ケニアの政府プロジェクトにブロックチェー...
  2. 再生医療、規制強化へ がん免疫療法の臨床...
  3. 4メートル超の大わらじ 浅草寺奉納へ出発...
  4. J-Startupをはじめとするベンチャ...

ニュース一覧

Layer-dependent ultrafast carrier and coherent phonon dynamics in black phosphorus.

著者 Miao X , Zhang G , Wang F , Yan H , Ji M
Nano Lett.2018 Apr 23 ; ():.
この記事をPubMed上で見るPubMedで表示
この記事をGoogle翻訳上で見る Google翻訳で開く

スターを付ける スターを付ける     (33view , 0users)

Full Text Sources

Black phosphorus is a layered semiconducting material, demonstrating strong layer-dependent optical and electronic properties. Probing the photophysical properties on ultrafast timescales is of central importance in understanding many-body interactions and non-equilibrium quasiparticle dynamics. Here, we applied temporally, spectrally and spatially resolved pump-probe microscopy to study the transient optical responses of mechanically exfoliated few-layer black phosphorous, with layer number ranging from 2 to 9. We have observed layer-dependent resonant transient absorption spectra with both photobleaching and redshifted photoinduced absorption features, which could be attributed to bandgap renormalization of higher subband transitions. Surprisingly, coherent phonon oscillations with unprecedented intensities were observed when the probe photons were in resonance with the optical transitions, which correspond to the low-frequency layer-breathing mode. Our results reveal strong Coulomb interactions and electron-phonon couplings in photoexcited black phosphorous, providing important insights into the ultrafast optical, nanomechanical and optoelectronic properties of this novel two-dimensional material.
PMID: 29684276 [PubMed - as supplied by publisher]
印刷用ページを開く Endnote用テキストダウンロード