Magnetic Depopulation of 1D Subbands in a Narrow 2D Electron Gas in a GaAs:AlGaAs Heterojunction

K. -F. Berggren; T. J. Thornton; D. J. Newson; M. Pepper

doi:10.1103/PhysRevLett.57.1769

Magnetic Depopulation of 1D Subbands in a Narrow 2D Electron Gas in a GaAs:AlGaAs Heterojunction

K. -F. Berggren, T. J. Thornton, D. J. Newson, and M. Pepper

Phys. Rev. Lett. 57, 1769 – Published 6 October 1986

Abstract

We present results on the transverse magnetoconductance in the range 0.3 to 8 T of a narrow, variable-width channel in a GaAs:AlGaAs heterojunction. As the width of the channel is decreased below 0.25 μm the structure in the magnetoconductance changes from Shubnikov-de Haas oscillations to the magnetic depopulation of one-dimensional subbands. A semiclassical WKB calculation is presented which gives good agreement with experiment.