2016
DOI: 10.1103/physrevb.94.155114
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Detecting a preformed pair phase: Response to a pairing forcing field

Abstract: The normal state of strongly coupled superconductors is characterized by the presence of "preformed" Cooper pairs well above the superconducting critical temperature. In this regime, the electrons are paired, but they lack the phase coherence necessary for superconductivity. The existence of preformed pairs implies the existence of a characteristic energy scale associated to a pseudogap. Preformed pairs are often invoked to interpret systems where some signatures of pairing are present without actual supercond… Show more

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Cited by 16 publications
(11 citation statements)
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“…For realistic values of the interaction parameter in graphene, the AF state is stabilized by a gain of potential energy ∆U < 0 corresponding to the reduction of the double occupation upon ordering. The above scenario mirrors the well-known DMFT picture [47][48][49][50] of the AF transition in the bulk Hubbard model, with its crossover from weakto-strong coupling physics at values of U of the order of the bandwidth. This consideration would put any realistic value of the interaction in ZGNF definitely on the weak-coupling (Slater) side.…”
Section: Resultssupporting
confidence: 75%
“…For realistic values of the interaction parameter in graphene, the AF state is stabilized by a gain of potential energy ∆U < 0 corresponding to the reduction of the double occupation upon ordering. The above scenario mirrors the well-known DMFT picture [47][48][49][50] of the AF transition in the bulk Hubbard model, with its crossover from weakto-strong coupling physics at values of U of the order of the bandwidth. This consideration would put any realistic value of the interaction in ZGNF definitely on the weak-coupling (Slater) side.…”
Section: Resultssupporting
confidence: 75%
“…At first sight this symmetry may appear rather surprising, because the physical properties of a given scattering channel in the repulsive and the attractive model are very different 43,49,50 , as dictated by the mapping of the physical degrees of freedom (cf. Eq.…”
Section: A Dmft Resultsmentioning
confidence: 99%
“…Preformed pairs are meant to be bound states which form above the critical temperature of a fermionic superfluid [1,2]. They are usually associated with the occurrence of a pseudo-gap which can be viewed as a carry-over of the pairing gap in the superfluid phase to the normal phase [3].…”
Section: Introductionmentioning
confidence: 99%