Infrared catastrophe and tunneling into strongly correlated electron systems: Beyond the x-ray edge limit
Infrared catastrophe and tunneling into strongly correlated electron systems: Beyond the x-ray edge limit
We develop a nonperturbative method to calculate the electron propagator in low-dimensional and strongly correlated electron systems. The method builds on our earlier work using a Hubbard-Stratonovich transformation to map the tunneling problem to the x-ray edge problem, which accounts for the infrared catastrophe caused by the sudden introduction of …