Zero-bias Anomaly of Tunneling into the Edge of a 2D Electron System

Abstract

We investigate the electron tunneling into the edge of a clean weakly interacting two-dimensional electron gas. It is shown that the corresponding differential conductance $G(V)$ has a cusp at zero bias, and is characterized by a universal slope $|dG/dV|$ at $V=0$. This singularity originates from the electron scattering on the Friedel oscillation caused by the boundary of the system.

10 pages, uuencoded compressed Postscript file, to appear in Phys. Rev. B (Rapid Communications)

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