Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session T60: Poster Session III
Thursday, March 8, 2018
LACC Room: West Hall A
Abstract: T60.00064 : Bloch-Grüneisen nonlinearity of electron transport in GaAs/AlGaAs heterostructures*
(Institute of Semiconductor Physics)
(Univ of Minnesota)
We report on nonlinear transport measurements in a two-dimensional electron gas hosted in GaAs/AlGaAs heterostructures. Upon application of direct current, the low-temperature differential resistivity acquires a positive correction, which exhibits a pronounced maximum followed by a plateau. With increasing temperature, the nonlinearity diminishes and disappears. These observations can be understood in terms of a crossover from the Bloch-Grüneisen regime to the quasielastic scattering regime as the electrons are heated by direct current. Calculations considering the interaction of electrons with acoustic phonons provide a reasonable description of our experimental findings.
*Supported by NSF Grant No. DMR-1309578, DOE Grant No. DE-FG0205-ER46212, NSF Cooperative Agreement No. DMR-1157490, the State of Florida. SNL is managed and operated by NT&ES of Sandia, for the DOE's NNSA under Contract No. DE-NA-0003525.
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