Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 23: Quantum wires: Transport properties (with TT)

HL 23.4: Vortrag

Montag, 31. März 2014, 16:45–17:00, POT 006

Transport measurements of ballistic quantum wires exposed to two magnetic spikes. — •Bernd Schüler1, Mihai Cerchez1, Hengyi Xu1, Thomas Heinzel1, and Andreas Wieck21Heinrich-Heine-Universität, 40225 Düsseldorf, Germany — 2Ruhr-Universität, 44780 Bochum, Germany

Quantum point contacts (QPC) are still fascinating elementary structures, which can lead in combination with localized magnetic fields to quite interesting effects [A. Tarasov et al., Phys. Rev. Lett. 104, 186801 (2010)]. We have designed a ferromagnet/semiconductor hybrid structure device which consists of a combination of an AFM-defined QPC and localized magnetic fields in the form of two magnetic spikes (magnetic barriers) at sub-micron distances inside the channel. The transport measurements are performed in the open regime of the QPC as function of a superimposed, homogeneous perpendicular magnetic field and as function of the barrier height. On top of the mode depopulation we found transmission resonances which could be explained with theoretically predicted signatures of zero-dimensional states weakly bound by the magnetic field [H. Xu et al. Phys. Rev. B 84, 035319 (2011)].

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