Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 48: Transport

HL 48.4: Vortrag

Dienstag, 1. April 2014, 14:45–15:00, POT 006

Electronic transport through nano sized GaAs pillars — Thorben Bartsch, Christian Heyn, and •Wolfgang Hansen — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Jungiusstraße 11, 20355 Hamburg, Germany

We perform magneto-transport experiments on GaAs nanopillars embedded in an AlGaAs matrix. The nanopillars are about 10 nm long, 100 nm in diameter and are epitaxially grown with perfect lattice match to n-doped, three-dimensional GaAs contact areas. Current-voltage characteristics and the magneto-conductance are investigated and compared to two reference samples containing undoped pillars and no pillars, respectively. A pronounced conductance peak observed in a magnetic field oriented along the pillar axis is discussed in terms of Chambers breakdown. In the voltage dependence of the differential conductance distinctive resonances are found that are not present in undoped pillars and the sample without pillars. These peaks slightly change with magnetic field. So far, the origin of the resonances is not clear. A possible mechanism leading to such oscillations will be discussed.