Electron transport through quantum wires and point contacts
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© 2004 American Physical Society (APS). This is the accepted version of the following article: Havu, P. & Puska, M. J. & Nieminen, Risto M. & Havu, V. 2004. Electron transport through quantum wires and point contacts. Physical Review B. Volume 70, Issue 23. 233308/1-4. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.70.233308, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.70.233308.
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en
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233308/1-4
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Physical Review B, Volume 70, Issue 23
Abstract
We have studied quantum wires using the Green’s function technique within density-functional theory, calculating electronic structures and conductances for different wire lengths, temperatures, and bias voltages. For short wires, i.e., quantum point contacts, the zero-bias conductance shows as a function of the gate voltage and at a finite temperature a plateau at around 0.7G0. (G0=2e2/h is the quantum conductance.) The behavior, which is caused in our mean-field model by spontaneous spin polarization in the constriction, is reminiscent of the so-called 0.7 anomaly observed in experiments. In our model the temperature and the wire length affect the conductance–gate-voltage curves similarly as in experiments.Description
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Havu, P. & Puska, M. J. & Nieminen, Risto M. & Havu, V. 2004. Electron transport through quantum wires and point contacts. Physical Review B. Volume 70, Issue 23. 233308/1-4. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.70.233308.