Magneto resistance oscillations in a modulated 2DEG periodic in the ratio h/e to flux per unit cell

Vasilopoulos, P., Wang, X.F., Peeters, F.M., Chowdhury, S., Long, A.R. and Davies, J.H. (2004) Magneto resistance oscillations in a modulated 2DEG periodic in the ratio h/e to flux per unit cell. Physica E: Low-Dimensional Systems and Nanostructures, 22(1-3), pp. 389-393. (doi:10.1016/j.physe.2003.12.028)

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Abstract

Transport properties of the 2DEG are studied in the presence of a normal magnetic field B and of a weak, two-dimensional periodic potential modulation. A tight-binding treatment has shown that each Landau level splits into several subbands with exponentially small gaps between them. Assuming the latter are closed due to disorder gives analytical wave functions and simplifies the evaluation of the magnetoresistance tensor ρμν. The relative phase of the oscillations in ρxx and ρyy depends on the modulation strengths and periods. For short periods l≤100 nm, in addition to the Weiss oscillations, the collisional contribution to the conductivity and the corresponding resistivity contribution show prominent peaks when one flux quantum h/e passes through an integral number of unit cells in good agreement with experiments. For periods 300–400 nm long used in early experiments, these peaks occur at fields 10–25 times smaller than those of the Weiss oscillations and are not resolved.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Long, Professor Andrew and Davies, Professor John
Authors: Vasilopoulos, P., Wang, X.F., Peeters, F.M., Chowdhury, S., Long, A.R., and Davies, J.H.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physica E: Low-Dimensional Systems and Nanostructures
Publisher:Elsevier BV
ISSN:1386-9477
ISSN (Online):1873-1759
Published Online:07 February 2004

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