Conductance transition and interwire ordering of Pb nanowires on Si(557)

Harumo Morikawa, Keun Su Kim, Yusuke Kitaoka, Toru Hirahara, Shuji Hasegawa, Han Woong Yeom

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A Pb-nanowire array on a stepped Si surface, Si (557) α×2-Pb, is investigated by surface-state conductivity measurements, scanning-tunneling microscopy (STM), and angle-resolved photoelectron spectroscopy (ARPES). No clear indication was found for the abrupt phase transition at 78 K, which was reported to exhibit a switching from a two-dimensional semiconducting conductivity to an one-dimensional metallic behavior and to accompany an intrawire ordering together with a change in the interwire periodicity (so-called "refacetting"). In contrast, a significant reduction in the surface conductivity is found at around 140 K. This transition is accompanied by a subtle out-of-phase interwire ordering of the protrusions along wires in STM images. However, ARPES finds no sign of a significant electronic structure change. While we cannot rule out the possibility of a phase transition at 78 K within a very limited coverage range, this metal-insulator-type transition is found to prevail for most of Pb coverages with a good α×2 ordering. The conductivity below 80 K can be described by the weak localization in two dimensions probably due to the interwire ordering but the abrupt transition at 140 K itself cannot easily be explained at present.

Original languageEnglish
Article number045423
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number4
DOIs
Publication statusPublished - 2010 Jul 21

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Scanning tunneling microscopy
Photoelectron spectroscopy
Nanowires
nanowires
Phase transitions
Surface states
conductivity
Electronic structure
Metals
Wire
scanning tunneling microscopy
photoelectron spectroscopy
periodic variations
indication
insulators
wire
electronic structure
metals

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Morikawa, Harumo ; Kim, Keun Su ; Kitaoka, Yusuke ; Hirahara, Toru ; Hasegawa, Shuji ; Yeom, Han Woong. / Conductance transition and interwire ordering of Pb nanowires on Si(557). In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 82, No. 4.
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Conductance transition and interwire ordering of Pb nanowires on Si(557). / Morikawa, Harumo; Kim, Keun Su; Kitaoka, Yusuke; Hirahara, Toru; Hasegawa, Shuji; Yeom, Han Woong.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 4, 045423, 21.07.2010.

Research output: Contribution to journalArticle

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