Transport of electrons in two-dimensional square and rectangular lateral surface superlattices

Chowdhury, S., Long, A.R., Skuras, E., Emeleus, C.J. and Davis, J.H. (2001) Transport of electrons in two-dimensional square and rectangular lateral surface superlattices. Journal of the Korean Physical Society, 39(3), 529 -533.

Abstract

We have studied commensurability oscillations (COs) in the magnetoresistance of two-dimensional lateral surface superlattices (LSSLS) with patterns having both square and rectangular symmetry. Square lattices of period 100 nm fabricated on orthodox GaAs/AlGaAs heterostructures showed weak COs corresponding to the lattice period. 100 by 170 nm rectangular lattices with the 170 run period along the current flow direction showed significant oscillations corresponding to this period for transport in all directions on the wafer. When a wafer containing a thin strained layer of InGaAs close to the surface was patterned to produce square 100 ran period superlattices with large asymmetry in the potential landscape, transport in the [011] direction (on a (100) wafer) showed pronounced oscillations with a period of 100 nm. period, as in one-dimensional LSSLs, while that along [011] showed no COs at all. For transport in the [010] and [001] directions, one of the diagonal Fourier potential components is dominant, and the commensurability oscillations in both samples were identical and had an effective period of 100/ square root 2 nm. All these results can be satisfactorily explained using a new theory of two-dimensional guiding center drift

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Long, Professor Andrew and Chowdhury, Soumyadeb
• Authors: Chowdhury, S., Long, A.R., Skuras, E., Emeleus, C.J., and Davis, J.H.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Journal of the Korean Physical Society
• ISSN: 0374-4884
• First Published: First published in Journal of the Korean Physical Society 39(3):529-533