Theorem on pseudospin and η-pairing superconductivity
Shun-Qing Shen
DOI 10.1103/PhysRevB.54.9039 · Physical Review B
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Abstract
We present a theorem on total pseudospin as an eigenvalue in a state. The total pseudospin is determined by the summation of the phase factors, written in terms of pseudospin operator and number of electrons. We discuss its relation with η-pairing superconductivity and ground-state energy level ordering of a system with pseudospin symmetry. Finally as an application of the theorem we show that the ground state of a generalized Hubbard model is superconducting for any electron filling. © 1996 The American Physical Society.
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