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FP6

Experimental and theoretical investigation of electron transport in ultra-narrow 1-dimensional nanostructures (ULTRA-1D) - Publishable Final Activity Report

Project ID: 505457
Funded under: FP6-NMP

Abstract

The main objective of the Ultra-1D Project has been to study the fundamental size limits, when the electron transport in one-dimensional (1D) systems can be considered qualitatively similar to macroscopic regime, and to explore qualitatively new phenomena appearing below the certain scale. Project has been focused on fabrication, theoretical and experimental study of electron transport in the state-of-the-art narrow 1D objects: normal metals, superconductors, semiconducting heterojunctions and carbon nanotubes.
Principal technological objective of the Project has been to elaborate old and develop new methods of microfabrication, pushing the reproducible limit of 1D object fabrication down to ~ 10 nm scale. Three independent, but complimentary methods have been used for fabrication of metallic systems: highresolution e-beam lithography, electrochemical growth of ultra thin nanowires, and progressive reduction of the effective diameter of pre-fabricated 1D objects by plasma etching. Principal technological objective related to activity with 1D semiconductors has been the fabrication of high-quality systems enabling application of external potential with period < 50 nm. Main technological objective related to electron properties of carbon nanotubes has been the fabrication of structures, formed of a single-wall carbon nanotube positioned (suspended) on top of terraced crystal plane or a cleaved edge of a superlattice.
Research activity with normal electron transport has been concentrated at three main topics: metalinsulator transition in ultra-thin wires, electron decoherence in 1D limit, peculiarities of electron transport in 1D systems with controlled external periodic potential. Study of superconductors has been be focused on the problem of quantum phase slips, which can be experimentally observed in ultra-thin 1D systems (wires and rings).

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Record Number: 9473 / Last updated on: 2008-10-30
Category: PROJ