What is the definition of momentum relaxation time in semiconductors?

In summary, momentum relaxation time is a concept in physics that measures the time it takes for a particle to lose its momentum due to interactions with other particles or its environment. It is important in understanding the behavior of particles in different systems and is used in various physical phenomena. Momentum relaxation time can be calculated using theoretical models and experimental techniques, and can be influenced by factors such as temperature, density, composition, and external fields. It is closely related to other physical properties such as electrical and thermal conductivity, diffusivity, and viscosity.
  • #1
n0_3sc
243
1
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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  • #2
It is the average time a carrier loses its original momentum due to a scattering event.
 
  • #3
seems understandable.

thanks.
 
  • #4
If you have an amazon account:


Page-9 gives a semi-classical treatment and a definition.
 
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FAQ: What is the definition of momentum relaxation time in semiconductors?

What is momentum relaxation time?

Momentum relaxation time is a concept in physics that measures the time it takes for a particle to lose its momentum due to interactions with other particles or its environment.

Why is momentum relaxation time important?

Momentum relaxation time is important because it helps us understand the behavior of particles in different systems and environments. It is a crucial parameter in various physical phenomena such as electrical conductivity, thermal conductivity, and viscosity.

How is momentum relaxation time calculated?

Momentum relaxation time can be calculated using various theoretical models and experimental techniques. One common method is by analyzing the scattering of particles in a material or system and using the Boltzmann transport equation to determine the relaxation time.

What factors affect momentum relaxation time?

Momentum relaxation time can be influenced by several factors, including the temperature, density, composition, and structure of the material or system. External factors such as electric and magnetic fields can also affect the momentum relaxation time.

How does momentum relaxation time relate to other physical properties?

Momentum relaxation time is closely related to other physical properties such as electrical and thermal conductivity, diffusivity, and viscosity. These properties are all affected by the interactions between particles, which are described by the momentum relaxation time.

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