Russian doll renormalization group and superconductivity
André LeClair, José María Román, Germán Sierra
DOI 10.1103/PhysRevB.69.020505 · Physical Review B
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Abstract
We show that a simple extension of the standard BCS Hamiltonian leads to an infinite number of BCS eigenstates with different energy gaps and self-similar properties, described by a cyclic renormalization group flow of the BCS coupling constant which returns to its original value after a finite renormalization group time.
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