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Author Topic: How do holes carry heat?  (Read 1376 times)

Offline thedoc

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How do holes carry heat?
« on: 26/09/2012 16:30:01 »
Tony Chang  asked the Naked Scientists:
   
If movement of holes results from electrons moving in the opposite direction,how do holes carry heat away in the p-type semiconductor?

If one side of the p-type semiconductor is heated, does the heat move from lattice vibration? If true, then heat would move regardless of the hole movement?

I did a lot of searching on internet, but I couldn't get an answer.

Thank you very much.

Sincerely,
Tony Hue
   
What do you think?
« Last Edit: 26/09/2012 16:30:01 by _system »


 

Offline evan_au

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Re: How do holes carry heat?
« Reply #1 on: 30/09/2012 12:49:22 »
When an electrical current flows in a P-Type semiconductor, a flow of holes can be viewed as "electrons moving in the other direction". However, it is equally valid to treat the hole as a virtual particle in its own right, generally with a different effective mass and velocity than an electron subject to the same electric field.

In the absence of an electric or thermal gradient:

The phonons & holes interact in a more direct way when voltage or thermal gradients appear:
« Last Edit: 30/09/2012 12:54:11 by evan_au »
 

Offline yor_on

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Re: How do holes carry heat?
« Reply #2 on: 01/10/2012 14:47:56 »
Phonon's are fascinating Evan. Been reading about superconductivity, in where the explanation to it becomes one of electrons, arranging themselves into Cooper pairs, overcoming their repulsion due to temperature and type of material. And what binds those electrons, carrying superconductivity, is phonon's. Small quantized 'packets' of 'vibrational energy'. The really interesting thing about them, to me, is that they reminds me so much of  photons, although in lattices as in a crystal.
=

Although I once again find this 'virtuality' being used to describe the process :)
It should be describable from a indeterministic state treating a Cooper pair as 'one thing' too, as I think? Especially as the coherence/influence of them are macroscopic.

"Careful examination of the boundary shows that it results from the long range of influence of the superconducting electrons over a macroscopic distance of about 104 cm., which is the coherence length."
« Last Edit: 01/10/2012 14:56:53 by yor_on »
 

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Re: How do holes carry heat?
« Reply #2 on: 01/10/2012 14:47:56 »

 

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