Effects of two dimensional plasmons on the tunneling density of states
D. V. Khveshchenko, Michael Reizer
Abstract
We show that gapless plasmons lead to a universal (δν(ε)/ν |ε|/EF) correction to the tunneling density of states of a clean two dimensional Coulomb interacting electron gas. We also discuss a counterpart of this effect in the "composite fermion metal" which forms in the presence of a quantizing perpendicular magnetic field corresponding to the half-filled Landau level. We argue that the latter phenomenon might be relevant for deviations from a simple scaling observed by A.Chang et al in the tunneling I-V characteristics of Quantum Hall liquids.
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