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Conductance through a one-atom point contact

✍ Scribed by F. Yamaguchi; Y. Yamamoto

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
267 KB
Volume
23
Category
Article
ISSN
0749-6036

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✦ Synopsis

Linear conductance and current-voltage characteristics in a one-atom point contact are calculated. A one-atom point contact is modeled by a double-barrier tunnel junction with a central island which is either a single atom or an atomic cluster. A finite electron reflection and induced charge at both sides of the tapered constriction alter the conductance from the quantum unit of conductance in a perfectly smooth point contact. The conductance is expressed in terms of a difference W between the work function of the electrodes and the atomic energy level, a charging energy U and an energy level broadening h in our simple model of a one-atom point contact.

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