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Calculation of the Potential Distribution around an Impurity-Atom-Wire--The Validity of the Thomas-Fermi Approximation--
Tomonori SEKIGUCHI Kazuhito FURUYA
IEICE TRANSACTIONS on Electronics
Publication Date: 1993/12/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Semiconductor Materials and Devices
impurity-atom-wire, quantum wire, nanometer structure, screening effect, electron wave,
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The potential distribution around a linear array of donor atoms in a semiconductor crystal is calculated, approximating the linear array by a continuous line charge. Two methods are used for the analysis. One is the self-consistent calculation of Poisson's equation and the effective mass Schrödinger's equation, and the other is the Thomas-Fermi approximation. Results of both methods agree very well, and it is shown that it is possible to form a potential distribution as fine as the electron wavelength by appropriate arrangement of the impurity atoms. Arrays of impurity atoms therefore can act as buiding elements for future electron wave devices.