The quantized Hall insulator

초록

The quantized Hall insulator is characterized by vanishing conductivities and a quantized flail resistance. For low mobility samples, the quantized Hall insulator is obtained when the magnetic field is increased well above the nu = 1 quantum Hall state. For higher mobility samples, a similar quantization is observed when the magnetic field is increased above the nu = 1/3 fractional quantum Hall states. This quantization, throughout the quantum Hall liquid-to-insulator transition, leads to a perfect semicircle relation for the diagonal and Hall conductivities. The measurements were performed in Ge/SiGe quantum Wells and in n-type InP/InGaAs and GaAs/AlGaAs heterostructures.

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