Anisotropic magnetoresistance in a 2DEG in a quasi-random magnetic field

Details Anisotropic magnetoresistance in a 2DEG in a quasi-random magnetic field Anisotropic magnetoresistance in a 2DEG in a quasi-random magnetic field

2003-08-22

arxiv.org/abs/cond-mat/0308452v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 6 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.193313

We present magnetotransport results for a 2D electron gas (2DEG) subject to the quasi-random magnetic field produced by randomly positioned sub-micron Co dots deposited onto the surface of a GaAs/AlGaAs heterostructure. We observe strong local and non-local anisotropic magnetoresistance for external magnetic fields in the plane of the 2DEG. Monte-Carlo calculations confirm that this is due to the changing topology of the quasi-random magnetic field in which electrons are guided predominantly along contours of zero magnetic field.

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