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Magnetotransport through AFM-defined antidot arrays

✍ Scribed by A Dorn; M Sigrist; A Fuhrer; T Ihn; T Heinzel; K Ensslin; W Wegscheider; M Bichler

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 194 KB
Volume: 13
Category: Article
ISSN: 1386-9477
DOI: 10.1016/s1386-9477(02)00267-9

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✦ Synopsis

Finite antidot arrays were fabricated by atomic force lithography using local anodic oxidation. Low-temperature magnetoresistance measurements on a square 20×20 antidot lattice with a period of a = 300 nm showed clear commensurability peaks as well as a quenching of the Hall e ect around zero magnetic ÿeld. In addition B-periodic oscillations were found superimposed on the main commensurability peak around one antidot at temperatures as high as 1:7 K. These observations indicate the high electronic quality of AFM-deÿned antidot lattices.

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We study the quasiclassical magnetoresistance xx (B) of a two-dimensional electron gas scattered by a random ensemble of antidots and, additionally, by a smooth random potential. We demonstrate that the combination of the two types of disorder yields qualitatively new behavior of xx (B). In particul