Separately contacted edge states: A new spectroscopic tool for the investigation of the quantum Hall effect

Details Separately contacted edge states: A new spectroscopic tool for the investigation of the quantum Hall effect Separately contacted edge states: A new spectroscopic tool for the investigation of the quantum Hall effect

2001-08-10

arxiv.org/abs/cond-mat/0108186v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 7 figures

Scientific paper

10.1103/PhysRevB.65.075303

Using an innovative combination of a quasi-Corbino sample geometry and the cross-gate technique, we have developed a method that enables us to separately contact single edge channels in the quantum Hall regime and investigate equilibration among them. Performing 4-point resistance measurements, we directly obtain information on the energetic and geometric structure of the edge region and the equilibration-length for current transport across the Landau- as well as the spin-gap. Based on an almost free choice in the number of participating edge channels and their interaction-length a systematic investigation of the parameter-space becomes possible.

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