Even-odd behavior and quantization of conductance in monovalent atomic contacts

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A Friedel-sum-rule-aided first-principles conductance calculation is presented for a sodium monatomic wire suspended between two bulk electrodes with sharp tip geometry. The conductance (G) is found to oscillate with the number (L) of atoms in the wire. For odd L, G has a quantized value of G(0) (=2e(2)/h), which is robust to the variation in wire geometry, while G is smaller than G(0) for even L, sensitive to the wire geometry. This even-odd behavior results from the sharp electrode tip and charge neutrality; the former generates resonant states, and the latter pins one of the resonant states at the Fermi energy for odd L. (C) 2002 Elsevier Science B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2002-07
Language
English
Article Type
Article
Keywords

SINGLE-CHANNEL SYSTEMS; GOLD ATOMS; BALLISTIC-RESISTANCE; PERFECT TRANSMISSION; POINT CONTACTS; SODIUM WIRES; TRANSPORT; SIGNATURE; PSEUDOPOTENTIALS; REFLECTION

Citation

PHYSICA E-LOW-DIMENSIONAL SYSTEMS NANOSTRUCTURES, v.14, no.4, pp.347 - 354

ISSN
1386-9477
DOI
10.1016/S1386-9477(01)00489-1
URI
http://hdl.handle.net/10203/22024
Appears in Collection
PH-Journal Papers(저널논문)
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