Resonance state in the 2D attractive Hubbard model |
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Authors: | Bumsoo Kyung |
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Institution: | Max Planck Institute for Physics of Complex Systems, Noethnitzerstrasse 38, 01187 Dresden, Germany |
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Abstract: | The systematic change of a resonance state with high momenta is studied with increasing particle density in the 2D attractive Hubbard model. Within the conserving self-consistent T-matrix approximation, we present the spectral functions for the one and two particle Green's functions as well as the self-energy. In the small density limit, the resonant state becomes stable and the result from the self-consistent calculations shows a good agreement with that from a simple analytical calculation. As particle density is increased, the resonance state acquires a short lifetime due to the increasing decay into two free particles. |
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Keywords: | Resonance states 2D attractive Hubbard model |
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