Transport Properties through Atomic-Size Point Contacts of Multi-Band Metals

Kyu Ueno, Mikio Eto, Kiyoshi Kawamura

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2 Citations (Scopus)

Abstract

The conductance through an atomic-size point contact is examined using tight-binding models. In a case of single s band, we observe the conductance quantization in units of 2e2/h when the atomic structure changes gradually from leads to the point contact. In the presence of broad s and narrow s bands, the conductance still seems quantized. In the presence of s and p bands, however, the conductance is substantially suppressed by the interband scattering. This is because the hybridization between s and p orbitals in the electronic states around the point contact differs from that in the bulk Bloch states, which disturbs the adiabatic conduction through the point contact. Based on the calculated results, we discuss a possible mechanism for the quantized conductance in units of e2/h which has been observed experimentally with Ni break-junctions.

Original languageEnglish
Pages (from-to)860-866
Number of pages7
JournalJournal of the Physical Society of Japan
Volume71
Issue number3
DOIs
Publication statusPublished - 2002 Mar 1

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Keywords

  • Break-junction
  • Conductance quantization
  • Interband scattering
  • Point contact

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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