Fermi Energy & Optical Transitions

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Discussion Overview

The discussion revolves around estimating the threshold for interband optical transitions in a two-dimensional solid with two electrons per unit cell, particularly in the context of weak crystal potentials and free electron behavior. The inquiry touches on concepts related to band structures and their implications for optical properties.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • Ian poses a question about estimating the threshold for interband optical transitions in a two-dimensional solid, indicating uncertainty about how to approach the problem.
  • Another participant inquires about Ian's background in physics and understanding of free electron metals, suggesting that foundational knowledge may be relevant to the discussion.
  • Ian later claims to have found an answer related to band structure but does not provide details on the calculation or the reasoning behind it.
  • A follow-up question asks Ian how he calculated the threshold, indicating interest in the method used.

Areas of Agreement / Disagreement

The discussion does not reach a consensus, as Ian initially expresses uncertainty and later claims to have found an answer without elaborating on the details. The inquiry into his understanding suggests varying levels of knowledge among participants.

Contextual Notes

There are limitations in the discussion regarding the specifics of the calculations and the assumptions made about the band structure and optical transitions. Ian's final answer is not detailed, leaving some aspects unresolved.

iansullivan88
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Hello,

I have a question which has something to do with band structures etc:

A two dimensional solid has two electrons per unit cell. The crystal potential is weak and the solid behaves like a free electron metal.

Estimate the threshold for interband optical transitions in terms of the fermi energy.


I have no idea where to begin with this really. Any help would be appreciated.

Thanks

Ian
 
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iansullivan88 said:
Hello,

I have a question which has something to do with band structures etc:

A two dimensional solid has two electrons per unit cell. The crystal potential is weak and the solid behaves like a free electron metal.

Estimate the threshold for interband optical transitions in terms of the fermi energy.


I have no idea where to begin with this really. Any help would be appreciated.

Thanks

Ian



How much physics have you done?

Do you know the physics behind free electron metals?
 
I found an answer now. It was to do with band structure. Thanks for trying to help.

Ian
 
iansullivan88 said:
I found an answer now. It was to do with band structure. Thanks for trying to help.

Ian

How did you calculate it in the end?
 

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