Nonlinear response of a MgZnO/ZnO heterostructure close to zero bias

Authors :: Shi, Q.
Zudov, M. A.
Falson, J.
Kozuka, Y.
Tsukazaki, A.
Kawasaki, M.
Smet, J.
Publication Year :: 2017
Abstract: We report on magnetotransport properties of a MgZnO/ZnO heterostructure subjected to weak direct currents. We find that in the regime of overlapping Landau levels, the differential resistivity acquires a quantum correction proportional to both the square of the current and the Dingle factor. The analysis shows that the correction to the differential resistivity is dominated by a current-induced modification of the electron distribution function and allows us to access both quantum and inelastic scattering rates.<br />Comment: 4 pages, 3 figures