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arxiv cond-mat/9912122 v3 pith:W3N6RFKE submitted 1999-12-07 cond-mat.mes-hall

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

R.J. Nicholas , K. Takashina , M. Lakrimi , B. Kardynal , S. Khym , N.J. Mason (Clarendon Lab , Oxford Univ.) , D.M. Symons
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D. K. Maude J.C. Portal (MIFKF-CNRS Grenoble)
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classification cond-mat.mes-hall
keywords systembehaviourfieldhallinsulatingmagneticquantumappearance
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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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