Point contact spectroscopy of magnetic edge states

N J Lambert, A R Nogaret, S Sassine, J C Portal, H E Beere, D A Ritchie

Research output: Contribution to journalArticlepeer-review


We report on a novel ballistic electron spectrometer that images the k-space structure of open orbits confined by a magnetic field gradient. Magnetoresistance measurements were performed on a AlGaAs/GaAs/Dy device which supported magnetic edge states. Point contacts were used to ensure the commensurability of edge state period to the length of the waveguide. Periodic oscillations in the non-local magnetoresistance were observed, which we ascribe to the discrete nature of the orbits. A semi-classical model is used to describe the device, and gives good agreement with experimental results.
Original languageEnglish
Pages (from-to)1507-1510
Number of pages4
JournalInternational Journal of Modern Physics B
Issue number8-9
Publication statusPublished - 2007


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