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Tunable electron heating induced giant magnetoresistance in the high mobility GaAs/AlGaAs 2D electron system

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep38516· OSTI ID:1430128
 [1];  [2];  [3];  [3];  [2]
  1. Georgia State Univ., Atlanta, GA (United States). Dept. of Physics and Astronomy; None
  2. Georgia State Univ., Atlanta, GA (United States). Dept. of Physics and Astronomy
  3. Federal Inst. of Technology, Zurich (Switzerland). Lab.fur Festkorperphysik

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.

Research Organization:
Georgia State Univ., Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0001762
OSTI ID:
1430128
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 6; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Mutual influence between current-induced giant magnetoresistance and radiation-induced magnetoresistance oscillations in the GaAs/AlGaAs 2DES journal July 2017
Coherent backscattering in quasi-ballistic ultra-high mobility GaAs/AlGaAs 2DES journal July 2018
Cyclotron resonance in the high mobility GaAs/AlGaAs 2D electron system over the microwave, mm-wave, and terahertz- bands journal February 2019
Radiation-induced magnetoresistance oscillations in monolayer and bilayer graphene journal May 2019
Microscopic model for radiation-induced magnetoresistance oscillations excited by circularly polarized radiation journal July 2019
Radiation-induced resistance oscillations in 2D electron systems with strong Rashba coupling preprint January 2017
Influence of Microwave Excitation‐Power on the Narrow Negative Magnetoresistance Effect Around B  = 0 T in the Ultra‐High Mobility GaAs/AlGaAs 2DES journal February 2019
Study of narrow negative magnetoresistance effect in ultra-high mobility GaAs/AlGaAs 2DES under microwave photo-excitation journal January 2020
Cyclotron resonance in the high mobility GaAs/AlGaAs 2D electron system over the microwave, mm-wave, and terahertz- bands text January 2019
Study of narrow negative magnetoresistance effect in ultra-high mobility GaAs/AlGaAs 2DES under microwave photo-excitation text January 2020