- #1
leoant
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Hello Everyone here:
I am reading the very paper of BCS theory by J.Bardeen, L.N.Cooper and J.R.Schrieffer (Phys.Rev.108, 1175,1957). But I find so many things hard to understand for me, though I have finished my Quantum Mechanics and Solid State Theory, especially a paragraph list below:
"Excited states are treated in much the same way as the ground state. One must distinguish between singly excited particles,in which one and only one of a pair (k,-k)is occupied, and excited or "real" pair states. We treat singly excited particles in the Bloch scheme, as in the normal metal. They contribute a negligible amount to the interaction energy directly, but reduce the amount of phase space available for real and virtual pairs..."
Here is my question:
1 what is the exact singly excited particles? and excited pair states? and "real" pair states? and virtual pairs (in the next paragraph of above in the very paper)?
2 what's Bloch scheme mean?
btw: this is just a small part of the original paper, I am afraid there would be mountains of questions contained in the paper, thus would some one be kind to refer me to some courses which explicit the BCS Theory specificly? And is there any schematic explanation of the theory( pls give me some step by step illustration on the paper or refer me to some close related papers or books which would make me feel free to read the theory)?
Thanks in advance.
My email: leoant21@hotmail.com
I am reading the very paper of BCS theory by J.Bardeen, L.N.Cooper and J.R.Schrieffer (Phys.Rev.108, 1175,1957). But I find so many things hard to understand for me, though I have finished my Quantum Mechanics and Solid State Theory, especially a paragraph list below:
"Excited states are treated in much the same way as the ground state. One must distinguish between singly excited particles,in which one and only one of a pair (k,-k)is occupied, and excited or "real" pair states. We treat singly excited particles in the Bloch scheme, as in the normal metal. They contribute a negligible amount to the interaction energy directly, but reduce the amount of phase space available for real and virtual pairs..."
Here is my question:
1 what is the exact singly excited particles? and excited pair states? and "real" pair states? and virtual pairs (in the next paragraph of above in the very paper)?
2 what's Bloch scheme mean?
btw: this is just a small part of the original paper, I am afraid there would be mountains of questions contained in the paper, thus would some one be kind to refer me to some courses which explicit the BCS Theory specificly? And is there any schematic explanation of the theory( pls give me some step by step illustration on the paper or refer me to some close related papers or books which would make me feel free to read the theory)?
Thanks in advance.
My email: leoant21@hotmail.com