Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 62: Quantum Dots and Wires: Transport Properties I (mainly Quantum Wires)
HL 62.2: Vortrag
Mittwoch, 28. März 2012, 15:15–15:30, EW 203
Observation of Electron Interference in GaAs/InAs Core/Shell Nanowires — •Önder Gül1,2, Christian Blömers1,2, Torsten Rieger1,2, Mihail I. Lepsa1,2, Hans Lüth1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,2,3 — 1Peter Grünberg Institute -9, Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology — 3II. Physikalisches Institut, RWTH Aachen, 52056 Aachen, Germany
Electron and spin interference in mesoscopic semiconductor systems is of fundamental interest for future spin- and quantum-based information technology. In this context, bottom-up device approaches such as templated self-assembled nanowires are particularly interesting.
Here we report on electron wave interference in GaAs/InAs core/shell nanowires grown by molecular beam epitaxy. Magnetotransport measurements were performed at 1.8 K and at magnetic fields up to 10 T. Additionally, gate voltage dependence of magnetotransport characteristics is investigated. Conductance oscillations are observed as a function of the magnetic field as well as the gate voltage. Fourier analysis of data suggests periodicity both in magnetic field and gate voltage. Further, phase-coherent transport properties of these nanowires are unravelled by applying the magnetic field in different orientations as well as by temperature dependent measurements.