L. Shekhtman et Li. Glazman, ZERO-BIAS ANOMALY OF TUNNELING INTO THE EDGE OF A 2-DIMENSIONAL ELECTRON-SYSTEM, Physical review. B, Condensed matter, 52(4), 1995, pp. 2297-2300
We investigate the electron tunneling into the edge of a clean weakly
interacting two-dimensional electron gas. It is shown that the corresp
onding differential conductance G(V) has a cusp at zero bias, and is c
haracterized by a universal slope \dG/dV\ at V=0. This singularity ori
ginates from the electron scattering on the Friedel oscillation caused
by the boundary of the system.