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

TL;DR

This paper studies the zero-bias conductance cusp in tunneling into a 2D electron system's edge, revealing a universal slope caused by Friedel oscillations, advancing understanding of edge electron interactions.

Contribution

It demonstrates the universal behavior of differential conductance at zero bias due to boundary-induced Friedel oscillations in a 2D electron gas.

Findings

Differential conductance G(V) exhibits a cusp at zero bias.

The slope |dG/dV| at V=0 is universal.

Friedel oscillations cause the observed singularity.

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.