Insulating states of a 2-dimensional electron-hole system in high magnetic field

We find that an InAs/GaSb based electron-hole system exhibits insulating behaviour when the numbers of occupied electron and hole Landau levels are equal. In this insulating state, the Hall resistance becomes symmetric under field reversal, and both the Hall and longitudinal resistances display repr...

Full description

Bibliographic Details
Main Authors: Takashina, K, Nicholas, R, Kardynal, B, Mason, N, Maude, D, Portal, J
Format: Conference item
Published: 2001
Description
Summary:We find that an InAs/GaSb based electron-hole system exhibits insulating behaviour when the numbers of occupied electron and hole Landau levels are equal. In this insulating state, the Hall resistance becomes symmetric under field reversal, and both the Hall and longitudinal resistances display reproducible fluctuations. A comparison with measurements made on a Corbino disc reveals that these features occur due to conduction at the mesa edge. We propose a simple model based on edge states.