European-Canadian Mesoscopics Initiative


ECAMI - EC-CAN002

Keywords: mesoscopic physics and technology, nanostructures


Start Date: 1 January 94 / Status: finished / Duration: 36 months

[ participants / contact]


Objectivies and Approach

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).

Progress and Results

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.

Information Dissemination Activities and/or Exploitation

Various results obtained by ECAMI partners have been presented at national and international conferences and workshops.


Coordinator

IMEC
Advanced Semiconductor Processing
Kapeldreef, 75
B - 3001 LEUVEN, B

EU Partners

IMEC, 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

Non-EU Partners

National Research Council of Canada (NRC),
Institute of Microstructural Sciences (IMS), CAN

CONTACT POINT

Dr. Wim Magnus
Tel: +32 16 28 13 16
Fax: +32 16 28 12 14
E-mail: magnus@imec.be


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ECAMI - EC-CAN002, May 1997


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html version of synopsis by Nick Cook