Metal-insulator oscillations in a two-dimensional electron-hole system

Robin J Nicholas, Kei Takashina, Mohammed Lakrimi, Beata Kardynal, Songwon Khym, Nigel J Mason, David M Symons, Duncan K Maude, Jean Claude Portal

Research output: Contribution to journalArticlepeer-review

24 Citations (SciVal)


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.
Original languageEnglish
Pages (from-to)2364-2367
JournalPhysical Review Letters
Issue number11
Publication statusPublished - 11 Sept 2000


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