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)
180 Downloads (Pure)

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.
Original languageEnglish
Article number233308
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B
Volume70
Issue number23
DOIs
Publication statusPublished - 17 Dec 2004
MoE publication typeA1 Journal article-refereed

Keywords

  • 0.7-anomaly
  • quantum wire
  • spin polarization

Fingerprint Dive into the research topics of 'Electron transport through quantum wires and point contacts'. Together they form a unique fingerprint.

Cite this