Experimental evidence for a two-dimensional quantized Hall insulator

M. Hilke (), D. Shahar, S. H. Song, D. C. Tsui, Y. H. Xie and Don Monroe
Additional contact information
M. Hilke: Princeton University
D. Shahar: Princeton University
S. H. Song: Princeton University
D. C. Tsui: Princeton University
Y. H. Xie: Bell Laboratories, Lucent Technologies
Don Monroe: Bell Laboratories, Lucent Technologies

Nature, 1998, vol. 395, issue 6703, 675-677

Abstract: Abstract The general theoretical definition of an insulator is a material in which the conductivity vanishes at the absolute zero of temperature. In classical insulators, such as materials with a band gap, vanishing conductivities lead to diverging resistivities. But other insulators can show more complex behaviour, particularly in the presence of a high magnetic field, where different components of the resistivity tensor can display different behaviours: the magnetoresistance diverges as the temperature approaches absolute zero, but the transverse (Hall) resistance remains finite. Such a system is known as a Hall insulator1. Here we report experimental evidence for a quantized2 Hall insulator in a two-dimensional electron system—confined in a semiconductor quantum well. The Hall resistance is quantized in the quantum unit of resistance h/e2, where h is Planck's constant and e the electronic charge. At low fields, the sample reverts to being a normal Hall insulator.

Date: 1998
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DOI: 10.1038/27160

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