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Characterization of Surface Modifications by White Light Interferometry: Applications in Ion Sputtering, Laser Ablation, and Tribology Experiments
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State-resolved ultrafast dynamics of impact ionization in InSb.

H Tanimura1, J Kanasaki1, K Tanimura1

  • 1The Institute of Scientific and Industrial Research, Osaka University, 8-1, Mihogaoka, Ibaraki, Osaka 567-0047, Japan.

Scientific Reports
|October 31, 2014
PubMed
Summary
This summary is machine-generated.

Impact ionization (IMP) in semiconductors is a state-selective process. This study reveals ultrafast hot electron dynamics in InSb, directly capturing IMP

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Area of Science:

  • Semiconductor physics
  • Ultrafast phenomena
  • Carrier dynamics

Background:

  • Impact ionization (IMP) is crucial for carrier multiplication in semiconductors.
  • IMP involves hot electron decay and electron-hole pair generation.
  • State-selective features of IMP are often limited by measurement resolution.

Purpose of the Study:

  • To investigate the state-resolved ultrafast hot electron dynamics of IMP.
  • To overcome methodological limitations in observing IMP's fundamental dynamics.
  • To determine the rate of IMP in a low band-gap semiconductor.

Main Methods:

  • Studied IMP in Indium Antimonide (InSb), a semiconductor with the lowest band-gap energy.
  • Utilized techniques to resolve hot electron dynamics at ultrafast timescales.
  • Directly measured state-resolved hot electron populations.

Main Results:

  • Directly captured the ultrafast decay of state-resolved hot electron populations.
  • Observed the corresponding population increase at the conduction band minimum.
  • Unambiguously determined the rate of impact ionization.

Conclusions:

  • Provided unprecedented insight into the physics of ultrafast electron correlation in semiconductors.
  • Demonstrated the importance of state-resolved measurements for understanding IMP.
  • Advanced the study of hot electron dynamics in low band-gap materials.