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Giant Magneto-Piezoresistance and Internal Friction in a Two-Dimensional Electron System

We use a micromechanical cantilever with an integrated two-dimensional electron system to show that an extremely small strain of the order of 10-4 induces a localized–delocalized electronic state transition. This strong strain effect improves the piezoresistive gauge factor by more than two orders of magnitude compared to the conventional Si cantilever. Furthermore, we found that the cantilever mechanical motion is affected considerably by friction exerted by the electron systems.