Colossal negative magnetoresistance in a 2D electron gas

Abstract

We report on a colossal negative magnetoresistance (MR) in 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 $B\approx 1$ 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 $B\approx 1$ 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.

References in corpus (4)

• Limit to 2D mobility in modulation-doped GaAs quantum structures: How to achieve a mobility of 100 millions
• Giant microwave photoresistivity in a high-mobility quantum Hall system
• Shubnikov-de Haas oscillations in GaAs quantum wells in tilted magnetic fields
• Phonon-induced resistance oscillations of two-dimensional electron systems drifting with supersonic velocities

Cited by in corpus (4)

• Electron hydrodynamics with a polygonal Fermi surface
• Hall field-induced resistance oscillations in Ge/SiGe quantum wells
• Commensurability resonances in two-dimensional magneto-electric lateral superlattices
• Nonlinear transport in 2D electron gas exhibiting colossal negative magnetoresistance