Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2001-06-21
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
3 pages, 3 figures
Scientific paper
10.1016/S1386-9477(01)00354-X
We have investigated the magnetoresistance of strongly asymmetric double-well structures formed by a thin AlGaAs barrier grown far from the interface in the GaAs buffer of standard heterostructures. In magnetic fields oriented parallel to the electron layers, the magnetoresistance exhibits an oscillation associated with the depopulation of the higher occupied subband and with the field-induced transition into a decoupled bilayer. In addition, the increasing field transfers electrons from the triangular to rectangular well and, at high enough field value, the triangular well is emptied. Consequently, the electronic system becomes a single layer which leads to a sharp step in the density of electron states and to an additional minimum in the magnetoresistance curve.
Cukr M.
Jansen L.
Jungwirth Tomas
Krupko Yu.
Smrcka Ludvik
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