Metal-Insulator Oscillations in a Two-Dimensional Electron-Hole System
Abstract
The electrical transport properties of a bipolar InAs/GaSb system have been studied in a magnetic field. The resistivity oscillates between insulating and metallic behavior while the quantum Hall effect shows a digital character oscillating from 0 to 1 conductance quantum e2/h. The insulating behavior 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.
- Publication:
-
Physical Review Letters
- Pub Date:
- September 2000
- DOI:
- 10.1103/PhysRevLett.85.2364
- arXiv:
- arXiv:cond-mat/9912122
- Bibcode:
- 2000PhRvL..85.2364N
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- 4 pages, 5 Postscript figures: revised version