Zero-Field Satellites of a Zero-Bias Anomaly

Abstract

Spin-orbit (SO) splitting, $\pm ω_{SO}$, of the electron Fermi surface in two-dimensional systems manifests itself in the interaction-induced corrections to the tunneling density of states, $ν(ε)$. Namely, in the case of a smooth disorder, it gives rise to the satellites of a zero-bias anomaly at energies $ε=\pm 2ω_{SO}$. Zeeman splitting, $\pm ω_{Z}$, in a weak parallel magnetic field causes a narrow {\em plateau} of a width $δε=2ω_{Z}$ at the top of each sharp satellite peak. As $ω_{Z}$ exceeds $ω_{SO}$, the SO satellites cross over to the conventional narrow maxima at $ε= \pm 2ω_{Z}$ with SO-induced plateaus $δε=2ω_{SO}$ at the tops.