Volume 61, Number 3, February 2003
|Page(s)||382 - 388|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 January 2003|
Chaos and open orbits in hole-antidot arrays with non-isotropic Fermi surface
Fakultät für Physik, Universität
Regensburg - D-93040 Regensburg, Germany
2 Walter Schottky Institut, Technische Universität München D-85748 Garching, Germany
3 Institut für Technische Physik III, Universität Erlangen-Nürnberg D-91058 Erlangen, Germany
4 NTT Basic Research Laboratories - Morinosato Wakamiya, Atsugi-shi Kanagawa 243-0198, Japan
Accepted: 18 November 2002
Periodic antidot arrays imposed upon two-dimensional hole systems (2DHSs) display a striking dependence of the positive low-field magnetoresistance on the in-plane crystallographic orientation of the superlattice. An enhanced positive magnetoresistance can be ascribed to the 2DHSs non-circular Fermi surface which stabilizes chaotic trajectories for specific crystallographic directions. The effect provides a first example of the role of non-spherical Fermi surfaces on the classical chaotic dynamics of charge carriers. Transport calculations taking into account both the classical chaotic motion of the holes in antidot lattices and the warped Fermi contour confirm this picture.
PACS: 73.50.Jt – Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects) / 73.61.Ey – III-V semiconductors / 73.63-b – Electronic transport in mesoscopic or nanoscale materials and structures
© EDP Sciences, 2003
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