Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 91: Superconductivity: (General) Theory 1

TT 91.5: Talk

Thursday, March 19, 2015, 12:30–12:45, H 2053

Critical analysis of the preformed pair physics: the attractive Hubbard model under a paring forcing field — •Agnese Tagliavini¹, Massimo Capone², and Alessandro Toschi¹ — ¹Institute for Solid State Physics, Vienna University of Technology, 1040 Wien, Austria — ²Scuola Internazionale Superiore di Studi Avanzati (SISSA), Trieste, Italy

The nature of the pseudogap features observed in correlated materials and its relation with superconductivity is still controversially debated. From the theoretical point of view, a new insight on the underlying physics can be obtained by studying the superconducting response to an external pairing field.

To this aim we consider the attractive Hubbard model where a preformed pair physics is realized in the strong-coupling limit: By means of Dynamical Mean-Field Theory, we study the superconducting response of the model to a static external pairing field (both uniform and local) focusing on the energetics.

We also compare our results with those obtained in the 2D repulsive Hubbard model, which is usually considered the basic model for high-Tc superconductors, where studies with cluster extensions of Dynamical Mean-Field Theory indicate the lack of preformed pairs.