A New Class of Resonances at the Edge of the Two Dimensional Electron Gas

Details A New Class of Resonances at the Edge of the Two Dimensional Electron Gas A New Class of Resonances at the Edge of the Two Dimensional Electron Gas

1996-01-31

arxiv.org/abs/cond-mat/9601157v1

Phys. Rev. Lett. 77, 1833-1836 (1996)

Physics

Condensed Matter

13 pages (revtex) including 4 figures

Scientific paper

10.1103/PhysRevLett.77.1833

We measure the frequency dependent capacitance of a gate covering the edge and part of a two-dimensional electron gas in the quantum Hall regime. In applying a positive gate bias, we create a metallic puddle under the gate surrounded by an insulating region. Charging of the puddle occurs via electron tunneling from a metallic edge channel. Analysis of the data allows direct extraction of this tunneling conductance. Novel conductance resonances appear as a function of gate bias. Samples with gates ranging from 1-170~$\mu$m along the edge display strikingly similar resonance spectra. The data suggest the existence of unexpected structure, homogeneous over long length scales, at the sample edge.

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