University of Minnesota
School of Physics & Astronomy
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Peter Martin

Colossal negative magnetoresistance in a two-dimensional electron gas
Q. Shi, P. D. Martin, Q. A. Ebner, M. A. Zudov, L. N. Pfeiffer, and K. W. West, Phys. Rev. B - Rapid Communications 90, 201301(R) (2014)

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We report on a colossal negative magnetoresistance (MR) in a GaAs/AlGaAs quantum well which, at low temperatures, is manifested by a drop of the resistivity by more than an order of magnitude at a magnetic field B≈1 kG. In contrast to MR effects discussed earlier, the MR reported here is not parabolic, even at small B, and persists to much higher in-plane magnetic fields and temperatures. Remarkably, the temperature dependence of the resistivity at B≈1 kG is linear over the entire temperature range studied (from 1 to 30 K) and appears to coincide with the high-temperature limit of the zero-field resistivity, hinting on the important role of acoustic phonons.