Keywords: mesoscopic physics and technology, nanostructures
Start Date: 1 January 94 / Status: finished / Duration: 36 months
[ participants / contact]
The aim of the project is to investigate research topics in the field of mesoscopic physics and technology, putting emphasis on low temperature, high magnetic field experiments on nanostructures, theoretical and experimental investigations of low-dimensional electron systems, and transport through quantum dots. This will also include discussions and exchanges of views in related areas, and a joint European-Canadian ECAMI workshop.
European links: This project involves seven participants of the Long Term Research Network of Excellence PHANTOMS-II (7360).
The ongoing collaboration between the University of Nottingham and the IMS (Ottawa) on the properties of composite fermions in bulk and mesoscopic devices was pursued. In particular, measurements were set up in order to investigate thoroughly the composite fermion effective mass, a subject of considerable controversy, and the results have been published. For the first time, experimental evidence for the presence of scrambling effects in composite fermions in mesoscopic devices have been obtained. Joint theoretical work was undertaken to calculate the tunneling characteristics of the loop-shaped RTDs thereby providing a detailed physical understanding of the experimental data; analytical and numerical calculations of the one-electron eigenstates in the emitter and quantum well elbows were performed.
At the MPI, the collaboration on Corbino devices with varying sizes was continued. A new project with the IMS on "semi-classical experiments for composite fermions" was initiated. The first experiment will focus on the observation of commensurability oscillations of composite fermions in anti-dot lattices.
In 1995, further progress has been achieved concerning the understanding of many-body excitations in GaAs/GaAlAs quantum wires and dots. A series of experiments were performed at AT&T Bell Laboratories, the NRC Ottawa and Glasgow university, some of them jointly, all in samples grown and fabricated in Glasgow. These experiments provided data which were amenable to comparison with theoretical models involving the Hartee formalism.
Various results obtained by ECAMI partners have been presented at national and international conferences and workshops.
Advanced Semiconductor Processing
B - 3001 LEUVEN, B
Max-Planck-Institut (MPI), Stuttgart, D
LMU Münich, D
RWTH Aachen, D
Thomson CSF, Orsay, F
University of Nottingham, UK
University of Glasgow, UK
National Research Council of Canada (NRC),
Institute of Microstructural Sciences (IMS), CAN
Dr. Wim Magnus
Tel: +32 16 28 13 16
Fax: +32 16 28 12 14
ECAMI - EC-CAN002, May 1997
please address enquiries to the ESPRIT Information Desk
html version of synopsis by Nick Cook