Journal
SCIENTIFIC REPORTS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep40492
Keywords
-
Categories
Funding
- Ministry of Science and Technology, Taiwan [101-2112-M-009-016-MY2, 103-2923-M-009-001-MY3, 103-2628-M-009-002-MY3, 103-2119-M-009-004-MY3, 103-2112-M-006-014-MY3, 103-2119-M-006-014-MY3]
- Ministry of Education (MOE-ATU plan at National Chiao Tung University)
- JSPS KAKENHI [15K17475]
- SENTAN
- JST (Japan Science and Technology Agency)
- RIKEN-IMS joint program on 'Extreme Photonics' and Consortium for Photon Science and Technology
- Grants-in-Aid for Scientific Research [15K17475] Funding Source: KAKEN
Ask authors/readers for more resources
In this study, we carried out 800-nm pump and ultra-broadband mid-infrared (MIR) probe spectroscopy with high time-resolution (70 fs) in bulk Ge. By fitting the time-resolved difference reflection spectra [Delta R(omega)/R(omega)] with the Drude model in the 200-5000 cm(-1) region, the time-dependent plasma frequency and scattering rate have been obtained. Through the calculation, we can further get the time-dependent photoexcited carrier concentration and carrier mobility. The Auger recombination essentially dominates the fast relaxation of photoexcited carriers within 100 ps followed by slow relaxation due to diffusion. Additionally, a novel oscillation feature is clearly found in time-resolved difference reflection spectra around 2000 cm(-1) especially for high pump fluence, which is the Lorentz oscillation lasting for about 20 ps due to the Coulomb force exerted just after the excitation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available