Effects of two dimensional plasmons on the tunneling density of states

Details Effects of two dimensional plasmons on the tunneling density of states Effects of two dimensional plasmons on the tunneling density of states

1997-06-12

arxiv.org/abs/cond-mat/9706129v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, Latex, NORDITA report

Scientific paper

10.1103/PhysRevB.57.R4245

We show that gapless plasmons lead to a universal $(\delta\nu(\epsilon)/\nu\propto |\epsilon|/E_F)$ 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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