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High-Field Magnetoresistance in a Periodically Modulated 2-Dimensional Electron-Gas
Geim, A K; Taboryski, R; Kristensen, A; Dubonos, S V; Lindelof, P E
Physical Review B. 1992;46(7):4324-4327.
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Abstract
We have extended earlier measurements of the magnetoresistance in a periodically modulated two-dimensional electron gas to high magnetic fields, where the cyclotron radius, r(c), is much smaller than the period, a, of modulation. A giant nonoscillatory magnetoresistance was found to arise beyond the range of low-field (Weiss) oscillations periodic in 1/B. Its value in a magnetic field of a few tesla may exceed the zero-field resistance value, rho-0, by 1 to 2 orders of magnitude. This result is in agreement with the semiclassical theory by Beenakker, if a modulation of the electron mobility is taken into account.
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