What is the definition of momentum relaxation time in semiconductors?

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Discussion Overview

The discussion revolves around the definition of "momentum relaxation time" in the context of semiconductors, specifically relating to silicon. Participants explore its implications and relevance in semiconductor physics.

Discussion Character

  • Conceptual clarification, Technical explanation

Main Points Raised

  • One participant seeks a definition of momentum relaxation time, noting its mention in a paper about silicon semiconductors.
  • Another participant defines momentum relaxation time as the average time a carrier loses its original momentum due to a scattering event.
  • A third participant expresses understanding of the definition provided.
  • A fourth participant suggests a resource for further reading, indicating that a semi-classical treatment and definition can be found on page 9 of a referenced source.

Areas of Agreement / Disagreement

Participants generally agree on the definition provided, but there is no consensus on a comprehensive understanding or additional context regarding momentum relaxation time.

Contextual Notes

The discussion does not delve into the mathematical formulation or specific conditions affecting momentum relaxation time, leaving some assumptions and dependencies unaddressed.

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What is a "momentum relaxtion time"? Tried googling it but couldn't get any definitions.

Comes from the sentence in a paper on silicon semiconductors:
"the momentum relaxation times lies in the subpicosecond regime...as a result free carriers can follow oscillations of an optical wave almost instantaneously..."
 
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It is the average time a carrier loses its original momentum due to a scattering event.
 
seems understandable.

thanks.
 
If you have an amazon account:


Page-9 gives a semi-classical treatment and a definition.
 
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