Renormalization-group exponents for superconducting phases in two-leg ladders
Yiwei Cai, Wen-Min Huang, Hsiu-Hau Lin
DOI 10.1103/PhysRevB.85.134502 · Physical Review B
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Abstract
In previous studies, we proposed a scaling ansatz for electron-electron interactions under renormalization group transformation. With the inclusion of phonon-mediated interactions, we show that the scaling ansatz, characterized by the divergent logarithmic length ld and a set of renormalization-group exponents, also works rather well. The superconducting phases in a doped two-leg ladder are studied and classified by these renormalization-group exponents as demonstration. Finally, nontrivial constraints among the exponents are derived and explained.
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