Luttinger liquid with one impurity: equivalent field theory and duality
V. V. Afonin, V. Yu. Petrov+
Ioffe Physical-Technical Institute of the RAS, 194021 St.Petersburg, Russia
+Petersburg Nuclear Physics Institute, 188300 St.Peterscburg, Russia
Abstract
We derive by functional integral method
1-dimensional theory equivalent to
Luttinger liquid with one impurity. It is shown that
the single quantity has to
be calculated for the formulation the effective field
theory is the electron
density jump at the impurity. We show that duality which
relates models with
electron-electron attraction and repulsion, and simultaneous
exchange of
transition and reflection coefficients, is
an exact property of the theory.