caa a22 4500 530098385 20181217030326.0 cr unu---uuuuu 181026e20161207xx s 000 0 eng 10.3929/ethz-b-000124784 doi 10.1038/srep38516 doi (ETHRESEARCH)oai:www.research-collection.ethz.ch:20.500.11850/124784 Tunable electron heating induced giant magnetoresistance in the high mobility GaAs/AlGaAs 2D electron system [Elektronische Daten] [Zhuo Wang, Rasanga L. Samaraweera, Christian Reichl, Werner Wegscheider, Ramesh G. Mani] Sci Rep Open access ethresearch 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 Idc and 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. Creative Commons Attribution 4.0 International http://creativecommons.org/licenses/by/4.0 ethresearch Electronic and spintronic devices ethresearch Electronic properties and materials ethresearch Wang Zhuo joint author Samaraweera Rasanga L. joint author Reichl Christian joint author Wegscheider Werner joint author Mani Ramesh G. joint author Scientific Reports London : Nature Publishing Group 6, p. 38516 2045-2322 http://hdl.handle.net/20.500.11850/124784 text/html WWW-Backlink auf das Repository (Open access) 1 Journal Article ethresearch ETHRESEARCH 856 40 http://hdl.handle.net/20.500.11850/124784 text/html WWW-Backlink auf das Repository (Open access) ETHRESEARCH 700 1- Wang Zhuo joint author ETHRESEARCH 700 1- Samaraweera Rasanga L. joint author ETHRESEARCH 700 1- Reichl Christian joint author ETHRESEARCH 700 1- Wegscheider Werner joint author ETHRESEARCH 700 1- Mani Ramesh G. joint author ETHRESEARCH 773 0- Scientific Reports London : Nature Publishing Group 6, p. 38516 2045-2322 BK010053 XK010053 XK010000 ETHRESEARCH ETHRESEARCH ETHRESEARCH Journal Article Open access