Instanton method for the electron propagator

Details Instanton method for the electron propagator Instanton method for the electron propagator

2001-05-08

arxiv.org/abs/cond-mat/0105172v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

EP2DS conference proceeding

Scientific paper

10.1016/S1386-9477(01)00248-X

A nonperturbative theory of the electron propagator is developed and used to calculate the one-particle Green's function and tunneling density-of-states in strongly correlated electron systems. The method, which is based on a Hubbard-Stratonovich decoupling of the electron-electron interaction combined with a cumulant expansion of the resulting noninteracting propagator, provides a possible generalization of the instanton technique to the calculation of the electron propagator in a many-body system. Application to the one-dimensional electron gas with short-range interaction is discussed.

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