Lermer, Markus and Reinwald, Elisabeth and Wegscheider, Werner and Weiss, Dieter (2006) Magnetotransport measurements on overgrown cleaved edge heterostructures in Hall bar geometry. Physica E 34 (1-2), pp. 116-119.
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Abstract We present new methods to pattern and characterize the overgrown cleaved egde (CE) of GaAs/AlGaAs heterostructures. Four point measurements, which allow a direct measurement of the magnetotransport coefficients rxx and rxy of a two- dimensional electron system on the CE, have been out of reach so far. By means of novel preparation techniques a contacted Hall bar structure can be created on the edge of the cleavage plane. The potential of the new method is first tested on a system which is density modulated in a direction parallel to the current flow due to an underlying GaAs/AlGaAs superlattice. To create a two- dimensional electric modulation we managed to pattern the active area of the Hall bar with periodically arranged lines in the direction perpendicular to the MBE-grown superlattice. The resulting unit cells are reflected in magnetoresistance oscillations associated with the most prominent one-dimensional Fermi contours along x- and y-direction.
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss|
Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider
|Keywords:||Ga[Al]As; Cleaved edge overgrowth; Two-dimensional electron system; Superlattice|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||20 Mar 2007|
|Last Modified:||20 Jul 2011 21:03|