Studies of the quantum Hall to quantum Hall insulator transition in InSb-based 2DESs

The temperature dependence of ρxx is studied in the vicinity of the quantum Hall to quantum Hall insulator transition (ν=1→0) in InSb/InAlSb based 2DESs. ρxx displays a symmetric temperature dependence about the transition with View the MathML source on the QH side and View the MathML source on the insulating side. A plot of 1/T0 for successive ν displays power-law divergence with 1/T0∝|ν−νc|−γ,2 with γ=2.2±0.3. This critical behavior in addition to the View the MathML source behavior expected of the quantum transport regime confirms that the QH/QHI transition is indeed a good quantum phase transition.