Metal-Insulator oscillations in a Two-dimensional Electron-Hole system

Details Metal-Insulator oscillations in a Two-dimensional Electron-Hole system Metal-Insulator oscillations in a Two-dimensional Electron-Hole system

1999-12-07

arxiv.org/abs/cond-mat/9912122v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 Postscript figures: revised version

Scientific paper

10.1103/PhysRevLett.85.2364

The electrical transport properties of a bipolar InAs/GaSb system have been studied in magnetic field. The resistivity oscillates between insulating and metallic behaviour while the quantum Hall effect shows a digital character oscillating from 0 to 1 conducatance quantum e^2/h. The insulating behaviour is attributed to the formation of a total energy gap in the system. A novel looped edge state picture is proposed associated with the appearance of a voltage between Hall probes which is symmetric on magnetic field reversal.

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