Roddaro, Stefano and Piazza, Vincenzo and Beltram, Fabio and Wegscheider, Werner and Liang, Chi-Te and Pepper, Michael
Magnetotransport in variable-coupling one-dimensional ballistic constrictions.
Journal of Applied Physics 92 (9), pp. 5304-5309.
A scheme to produce closely spaced high-quality one-dimensional electronic channels is presented. It is based on standard nanolithography fabrication applied to a single, wide quantum well AlGaAs/GaAs heterostructure where the spatial separation of the wire modes is given by Coulomb repulsion. The lack of a composition-induced barrier in the double layer leads to electron mobility of 5×106 cm2/Vs in the starting double two-dimensional system. This in turn yields high-quality one-dimensional channels following nanolithography, as shown by our detailed analysis of the magnetotransport properties of the system. Variable coupling is achieved by split-gate polarization and external magnetic-field intensity and orientation. The relevance for the implementation of coherent nanodevices of this fabrication approach is discussed.
|Date:||1 November 2002|
|Institutions:|| Physics > Institute of Experimental and Applied Physics > Retired Professors > Group Werner Wegscheider|
|73.63.Nm; 72.20.My; 81.07.Vb; 81.16.Nd; 85.40.Hp||PACS|
|Keywords:|| galvanomagnetic effects, aluminium compounds, gallium arsenide, III-V semiconductors, semiconductor quantum wells, semiconductor quantum wires, electron mobility, lithography, nanotechnology|
|Subjects:||500 Science > 530 Physics|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||07 Dec 2009 13:22|
|Last Modified:||20 Jul 2011 22:11|