Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 42: Transport

HL 42.7: Vortrag

Donnerstag, 15. März 2018, 16:30–16:45, EW 015

Electron focusing at closed magnetic barriers — Bernd Schüler, •Mihai Cerchez, and Thomas Heinzel — Heinrich Heine University Düsseldorf, 40225, Düsseldorf

Ballistic electrons may pass through closed magnetic barriers [1] (high enough to turn the electrons around) in 2DEGs only by means of ExB drift at the edge [2]. We show that the exiting electron flow is restricted to a certain angular range. Experimentally, we probe this by using a second magnetic barrier placed at various distances from the first one, and measuring the magnetoresistance. The ballistic effects observed are oscillations of the magnetoresistance with a maximum amplitude of more than twice the magnetoresistance of a single magnetic barrier. [1] F. M. Peeters and A. Matulis, Phys. Rev. B 48, 15166, 1993. [2] M. Cerchez, S. Hugger, T. Heinzel, and N. Schulz, Phys. Rev. B 75, 035341, 2007.