Talk:Cooper pair

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Contents 1 Copyright violation 2 Densitiy of carriers 3 Comparison 4 Simplification? 5 Orphan line?

[edit] Copyright violation

This page appears to be copied completely from http://hyperphysics.phy-astr.gsu.edu/Hbase/solids/coop.html. According to the Copyright info on this page it's not allowed to just be copied, but the author seems open to licencing for educational purposes, which might include Wikipedia. Do we have permission, or does anyone feel like asking? --Apyule 06:54, 3 October 2006 (UTC)

Copyright violation resolved. Good catch! Nbishop 03:36, 17 October 2006 (UTC)

[edit] Densitiy of carriers

How can the electrons be 100 nm apart? Mercury is a metal. It has a lot electrons at the fermi energy. Arnero 21:40, 4 December 2006 (UTC)

There are a lot of electrons between two which form a cooper pair; the distance of 100-1000nm refers to the two electrons which form a pair. Even though it is hard to imagine, cooper pairs are a lot larger than the average distance between cooper pairs, or individual electrons for that matter. --Jonasbinding 12:41, 24 August 2007 (UTC)

[edit] Comparison

How is this binding related to Covalent bond or Van der Waals' forces ? Arnero 21:40, 4 December 2006 (UTC)

Covalent and VdW bonds refer to how electrons bind atoms together. A cooper pair refers to how Phonons bind two electrons together, which would otherwise move relatively free inside a metal. --Jonasbinding 12:41, 24 August 2007 (UTC)

[edit] Simplification?

Does the following phrase really belong in a section called "A simplified explanation"?

"...consider that many quasiparticles are more localized in K-space than in the usual space."

[edit] Orphan line?

What does "The pair are still Cooperic if k1 = k2 and k1 − q = − (k1 − q) = − ( − k2 − q) = − (k2 + q)" mean? This is the only time that those letters are used - it feels like this is an orphan from a previous edit. Alec.brady 09:42, 7 June 2007 (UTC)

Looking at the history, it's not left from an old edit, but it does feel like an orphan line and doesn't fit into the article. k1 and k2 presumably refer to the wave vectors of the electrons, q to a phonon they exchange (standard notation); but I'm not familiar with the statement itself, so I don't feel capable of improving it. I'd take it out; it's certainly a rather special case which doesn't fit the rest of the article. --Jonasbinding 12:41, 24 August 2007 (UTC)