Abstract
The magnetoresistances of two-dimensional electron systems in strained silicon on a relaxed silicon-germanium buffer have been measured at low temperatures (50 mK). Samples, with Hall mobilities up to 3.61 × 105 cm2 V-1 s-1, have shown a marked asymmetry between adjacent Shubnikov-de Haas peaks and a prominent overshoot on the low-field side of the odd-filling-factor quantum Hall plateaux. This effect persisted to unusually small magnetic fields. It is argued that both of these phenomena can be explained by a strong back-scattering of multiple edge modes which is suppressed at integer filling factors.
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