title: Tunable electron heating induced giant magnetoresistance in the high mobility GaAs/AlGaAs 2D electron system.
abstract: Electron-heating induced by a tunable, supplementary dc-current (Idc) helps to vary the observed magnetoresistance in the high mobility GaAs/AlGaAs 2D electron system. The magnetoresistance at B = 0.3 T is shown to progressively change from positive to negative with increasing Idc, yielding negative giant-magnetoresistance at the lowest temperature and highest Idc. A two-term Drude model successfully fits the data at all Idcand T. The results indicate that carrier heating modifies a conductivity correction σ1, which undergoes sign reversal from positive to negative with increasing Idc, and this is responsible for the observed crossover from positive- to negative- magnetoresistance, respectively, at the highest B.
authors.affiliation: Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA.
authors.forename: Zhuo
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA.
authors.forename: R L
authors.initials: RL
authors.lastname: Samaraweera
authors.affiliation: Laboratorium für Festkörperphysik, ETH-Zürich, Zürich 8093, Switzerland.
authors.forename: C
authors.initials: C
authors.lastname: Reichl
authors.affiliation: Laboratorium für Festkörperphysik, ETH-Zürich, Zürich 8093, Switzerland.
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider
authors.affiliation: Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA.
authors.forename: R G
authors.initials: RG
authors.lastname: Mani