Giant negative magnetoresistance in high-mobility 2D electron systems

Abstract

We report on a giant negative magnetoresistance in very high mobility GaAs/AlGaAs heterostructures and quantum wells. The effect is the strongest at $B\simeq 1$ kG, where the magnetoresistivity develops a minimum emerging at $T\lesssim 2$ K. Unlike the zero-field resistivity which saturates at $T\simeq 2$ K, the resistivity at this minimum continues to drop at an accelerated rate to much lower temperatures and becomes several times smaller than the zero-field resistivity. Unexpectedly, we also find that the effect is destroyed not only by increasing temperature but also by modest in-plane magnetic fields. The analysis shows that giant negative magnetoresistance cannot be explained by existing theories considering interaction-induced or disorder-induced corrections.

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