Deviation of the quantum hall effect from exact quantization in narrow GaAs-AlxGa1-xAs heterostructure devices


Journal Article

We report the first observation of deviaton of the i=4 quantum Hall plateau from its quantized value, in narrow GaAs-AlxGa1-xAs quasi-1-d wires of width 2000A. The deviation arises in the form of aperiodic fluctuations as the magnetic field is varied, even though a deep minimum developes in longitudinal resistance. The fluctuation size grows with decreasing temperature and can be as large as 250Ω at 50mK. We suggest the observations arise from a combination of localization and Aharonov-Bohm quantum interference effects. © 1988.

Full Text

Duke Authors

Cited Authors

  • Chang, AM; Timp, G; Chang, TY; Cunningham, JE; Mankiewich, PM; Behringer, RE; Howard, RE

Published Date

  • January 1, 1988

Published In

Volume / Issue

  • 67 / 8

Start / End Page

  • 769 - 772

International Standard Serial Number (ISSN)

  • 0038-1098

Digital Object Identifier (DOI)

  • 10.1016/0038-1098(88)90021-X

Citation Source

  • Scopus