Publications [#245821] of Albert M. Chang

Papers Published
  1. Chang, AM; Timp, G; Chang, TY; Cunningham, JE; Mankiewich, PM; Behringer, RE; Howard, RE, Deviation of the quantum hall effect from exact quantization in narrow GaAs-AlxGa1-xAs heterostructure devices, Solid State Communications, vol. 67 no. 8 (1988), pp. 769-772 .

    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.