Unidirectional Transmission of Electrons in a Magnetic Field Gradient

Details Unidirectional Transmission of Electrons in a Magnetic Field Gradient Unidirectional Transmission of Electrons in a Magnetic Field Gradient

2003-11-10

arxiv.org/abs/cond-mat/0311214v1

Physica E 21, 451 (2004).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 5 figures, presented at 11th Int. Conf. on Modulated Semiconductor Structures Nara, July 2003. To be published in Phy

Scientific paper

10.1016/j.physe.2003.11.059

The work presents an experimental demonstration of time-reversal asymmetry of electron states propagating along boundary separating areas with opposite magnetic fields. For this purpose we have fabricated a hybrid ferromagnet-semiconductor device in form of a Hall cross with two ferromagnets deposited on top. The magnets generated two narrow magnetic barriers of opposite polarity in the active Hall area. We have observed that if the signs of the barriers are reversed, the bend resistance changes its sign. Using the Landauer-Buttiker theory, we have demonstrated that this is a direct consequence of asymmetric transmission of the "snake" and the "cycloidal" trajectories formed the boundary separating the regions with opposite magnetic field directions.

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