Tornow, M and Weiss, Dieter and Klitzing, K and Shitara, T and Kurtenbach, A and Eberl, K (1996) Magnetotransport phenomena in single AlGaAs/GaAs quantum wires grown on laterally patterned substrates. Solid State Electronics 40, p. 323.
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Other URL: http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TY5-3SP95S7-25&_user=616165&_coverDate=12%2F31%2F1996&_rdoc=70&_fmt=high&_orig=browse&_srch=doc-info(%23toc%235609%231996%23999599998%2310163%23FLP%23display%23Volume)&_cdi=5609&_sort=d&_docanchor, http://www.sciencedirect.com/science/journal/00381101
Single, sub-micrometer wide quantum wires have been fabricated using molecular beam epitaxy on mesa-etched GaAs substrates, where the GaAs wire is embedded in AlGaAs. By using a Hall bar pattern, potential probes were directly attached to the wires while grown. To avoid problems associated with anisotropic etching and regrowth, the wire structures were oriented along the 100 crystallographic directions. From this fabrication technique, described in detail by Shitara et al., Appl. Phys. Lett. 66, 2385 (1995), one can expect the formation of high quality self-aligned quantum wires with a confinement potential determined by the conduction band discontinuity of AlGaAs and GaAs. Here we study the four-point magnetoresistance of 50 ìm long single quantum wires with widths between 250 and 700 nm from 1.3 to 21 K. A distinct weak localization peak and universal conductance fluctuations dominate the low magnetic field regime and are used to estimate the phase- coherence length of the electrons. Pronounced 1/B periodic quantum oscillations at magnetic fields above 1 T are consistent with the picture of wires with a square-well shaped confining potential.
|Institutions:||Physics > Institute of Experimental and Applied Physics > Chair Professor Weiss > Group Dieter Weiss|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||25 May 2009 13:20|
|Last Modified:||05 Aug 2009 13:57|