Pairing fluctuations induced pseudogap in the Attractive Hubbard Model
Abstract
Although the underlying mechanism is not completely understood, pairing of electrons is generally associated with superconductivity. Above the superconducting transition, in the normal state, the high temperature superconductors exhibit a pseudogap phase, which can be interpreted as the result of pairing fluctuations above Tc. The Attractive Hubbard Model (AHM) is a minimal model that allows the investigation of pairing, enabling us to gain some insight into the relevant physics of the superconductivity and the pseudogap phenomenon. We investigate the single-particle spectral properties of the normal phase of the AHM. Using the Non-Self-Consistent T-Matrix Approximation, we calculate a self-energy that incorporates pairing fluctuations above the critical temperature. The calculation is done on the real axis by exploiting the Kramers-Kronig relations. The opening of a pseudogap is observed as the critical temperature is approached.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2004
- Bibcode:
- 2004APS..MARU38004V