Pseudogap in the one-electron spectral functions of the attractive Hubbard model

We calculate the one-electron Green's function of the two-dimensional (2D) attractive Hubbard model by coupling the electrons to pair fluctuations. The latter are approximated by homogeneous amplitude fluctuations and phase correlations corresponding to the XY-model. The electronic density of states shows a pseudogap at temperatures well above the transition temperature Tc. For a quasi-3D system, a superconducting gap emerges out of the pseudogap below Tc.


Published in:
Physica B, 259-261, 501-503
Year:
1999
Publisher:
Elsevier
ISSN:
0921-4526
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2015-04-20, last modified 2018-01-28

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