Weiss, Dieter and Menschig, A. and Klitzing, Klaus von and Weimann, G. (1992) Magnetoresistance in a Grid-Type Lateral Superlattice: The Role of Disorder. Surface Science 263, pp. 314-318.
Other URL: http://www.sciencedirect.com/science?_ob=ArticleListURL&_method=list&_ArticleListID=859387224&_sort=d&view=c&_acct=C000032338&_version=1&_urlVersion=0&_userid=616165&md5=2f0f87fceaf3287a7b186b785ea97006, http://www.sciencedirect.com/science/journal/00396028
The magnetoresistance of a two-dimensional electron gas (2DEG) subjected to a weak two- dimensional (2D) lateral superlattice potential is expected to reflect the peculiar self-similar energy spectrum of Bloch electrons in a magnetic field, i.e., the splitting of Landau levels (LLs) into sublevels. One experimentally established effect of a periodic potential is that the discrete LLs are transformed into Landau bands and cause magnetoresistance oscillations due to an extra band- conductivity contribution. Theoretically, this band-conductivity contribution is expected to be suppressed if the splitting of the Landau bands is resolved. We study the suppression of the band-conductivity as a function of the electron mobility at millikelvin temperatures. Microfabricated gates, defined on top of high mobility GaAs/AlGaAs heterojunctions. are used to electrostatically impose a 2D-periodic potential with 150 nm period upon the 2DEG. By applying a positive bias the electron mobility is increased and we find the band- conductivity effectively suppressed if the mobility is well above 1 × 106 cm2/Vs.
|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:||Unknown|
|Deposited On:||25 May 2009 13:19|
|Last Modified:||13 Mar 2014 14:16|