Tunneling Between Two-Dimensional Electron Gases in a Weak Magnetic Field

Details Tunneling Between Two-Dimensional Electron Gases in a Weak Magnetic Field Tunneling Between Two-Dimensional Electron Gases in a Weak Magnetic Field

1995-03-08

arxiv.org/abs/cond-mat/9503040v1

Physics

Condensed Matter

REVTeX 3.0 macros required, 4 pages text, 3 postscript figures in a second file

Scientific paper

We have measured the tunneling between two two-dimensional electron gases (2DEGs) in weak magnetic fields, when the carrier densities of the two electron layers are matched. At zero magnetic field, B=0, the lineshape of the equilibrium tunneling resonance is best fit by a Lorentzian, with a linewidth which is determined by the roughness of the tunnel barrier. For $B\not=0$ with filling factors $\nu\gg 1$, there is a suppression of the resonant tunneling conductance about zero bias, $V_{\text{sd}}=0$. This low field signature of the high field Coulomb gap shows the same linear $B$ dependence as previously measured for $\nu<1$.

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