Electron transport through quantum wires and point contacts

P Havu, M.J. Puska, R.M. Nieminen, V. Havu

Research output: Contribution to journalArticleScientificpeer-review

51 Citations (Scopus)
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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.
Original languageEnglish
Article number233308
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B
Issue number23
Publication statusPublished - 17 Dec 2004
MoE publication typeA1 Journal article-refereed


  • 0.7-anomaly
  • quantum wire
  • spin polarization

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