Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 48: Transport

HL 48.3: Vortrag

Dienstag, 1. April 2014, 14:30–14:45, POT 006

Magneto-Oscillations in GaAs/InAs Core/Shell Nanowires — •Fabian Haas1,2, Tobias Wenz1,2, Patrick Zellekens1,2, Natalia Demarina1,2, Torsten Rieger1,2, Mihail Lepsa1,2, Detlev Grützmacher1,2, Hans Lüth1,2, and Thomas Schäpers1,21Peter Grünberg Institute - 9, Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA - Fundamentals of Future Information Technology

In GaAs/InAs core/shell nanowires the electrons are confined in the hollow cylindrical conductive InAs shell. The ring geometry of this InAs nanotube allows flux periodic modulation of the electron concentration in magneto-transport measurements, if a magnetic field is aligned alongside the nanowire axis. Magneto-oscillations with h/e periodicity are expected due to one-dimensional transport through angular momentum states, which are solutions to the Schrödinger equation for a radially confined system.

In this contribution, we present magneto-transport measurements of several GaAs/InAs core/shell nanowires of different dimensions. Pronounced oscillations with h/e periodicity are found in the magneto-conductance of all the wires. By variation of external parameters such as temperature, gate voltage and tilt angle with the magnetic field the underlying energetic spectrum is analyzed.

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