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

K. M. Brown·N. Turner·J. T. Nicholls·E. H. Linfield·M. Pepper·D. A. Ritchie·G. A. C. Jones
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Abstract

We have measured the tunneling between two two-dimensional electron gases at high magnetic fields $B$, when the carrier densities of the two electron layers are matched. For filling factors $ν<1$, there is a gap in the current-voltage characteristics centered about $V=0$, followed by a tunneling peak at $\sim 6$~mV. Both features have been observed before and have been attributed to electron-electron interactions within a layer. We have measured high field tunneling peak positions and fitted gap parameters that are proportional to $B$, and independent of the carrier densities of the two layers. This suggests a different origin for the gap to that proposed by current theories, which predict a $\sqrt{B}$ dependence.

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K. M. Brown, N. Turner, J. T. Nicholls, E. H. Linfield, M. Pepper, D. A. Ritchie, G. A. C. Jones. 1994-10-03. Tunneling Between Two-Dimensional Electron Gases in a Strong Magnetic Field. https://doi.org/10.1103/physrevb.50.15465

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