Electron transport through quantum wires and point contacts
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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4
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Physical Review B, Volume 70, issue 23, pp. 1-4
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, R M & Havu, V 2004, 'Electron transport through quantum wires and point contacts', Physical Review B, vol. 70, no. 23, 233308, pp. 1-4. https://doi.org/10.1103/PhysRevB.70.233308