One-electron spectral functions of the attractive Hubbard model for intermediate coupling

We calculate the one-electron spectral function of the attractive (negative-U) Hubbard model. We work in the intermediate-coupling and low-density regime and obtain the self-energy in an approximate analytical form. The excitation spectrum is found to consist of three branches. The results are obtained in a framework based on the self-consistent T -matrix approximation, which is compatible with the Mermin-Wagner theorem.


Published in:
Physical Review -Series B-, 57, 10, 5995-6002
Year:
1998
Publisher:
American Physical Society
ISSN:
1098-0121
Laboratories:


Note: The status of this file is: EPFL only


 Record created 2015-04-21, last modified 2018-09-13

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