Electron transport through quantum wires and point contacts

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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2004-12-17

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Department of Applied Physics
Department of Mathematics and Systems Analysis

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en

Pages

4
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.

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Keywords

0.7-anomaly, quantum wire, spin polarization

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DOI

10.1103/PhysRevB.70.233308

Citation

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

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https://urn.fi/URN:NBN:fi:aalto-201805222246

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[article-cris] Perustieteiden korkeakoulu / SCI