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We report experimental observations of a novel magnetoresistance (MR)behavior of two-dimensional electron systems in perpendicular magnetic field inthe ballistic regime, for k_BT\tau/\hbar>1. The MR grows with field andexhibits a maximum at fields B>1/\mu, where \mu is the electron mobility. Astemperature increases the magnitude of the maximum grows and its position movesto higher fields. This effect is universal: it is observed in various Si- andGaAs- based two-dimensional electron systems. We compared our data with recenttheory based on the Kohn anomaly modification in magnetic field, and foundqualitative similarities and discrepancies.

Non-monotonic magnetoresistance of two-dimensional electron systems in the ballistic regime