Off-diagonal long-range order in the BCS
✍
Marvin E Rensink
📂
Article
📅
1967
🏛
Elsevier Science
🌐
English
⚖ 339 KB
The two-particle reduced density matrix p2 is analyzed for a system of electrons described by the BCS ground state. The existence of off-diagonal longrange order in pZ is demonstrated by explicit calculation of its matrix elements. It is shown that pz has one eigenvalue proportional to N where N is