Nano Archive

Quantum transport in low-dimensional AlGaN/GaN systems

Spirito, D. and Frucci, G. and Di Gaspare, A. and Di Gaspare, L. and Giovine, E. and Notargiacomo, A. and Roddaro, S. and Beltram, F. and Evangelisti, F. (2011) Quantum transport in low-dimensional AlGaN/GaN systems. Journal of Nanoparticle Research, 13 (11). pp. 5699-5704.

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Abstract

In this work, we investigated the magnetotransport properties of a two dimensional electron gas hosted in an AlGaN/AlN/GaN heterostructure and one-dimensional devices fabricated on it. At cryogenic temperature, high mobility and long mean free path is achieved, allowing ballistic transport experiments. Longitudinal resistivity measured in Hall bar geometry shows well-developed Shubnikov–de Haas oscillations with amplitude modulation. Amongst possible mechanisms, the zero-field spin splitting may be the origin of the observed effects. Split gate quantum point contacts were fabricated by electron beam lithography. Linear conductance measurements at zero magnetic field show clear quantized conductance plateaus at 2e2/h and 4e2/h. Non-perfectly quantized conductance values are found for higher plateaus, suggesting the presence of impurity scattering.

Item Type:Article
ID Code:11562
Deposited By:Prof. Alexey Ivanov
Deposited On:05 Jan 2012 09:30
Last Modified:05 Jan 2012 09:42

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