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 language | English |
|---|---|
| Article number | 045423 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 82 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2010 Jul 21 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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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 journal › Article
TY - JOUR
T1 - Conductance transition and interwire ordering of Pb nanowires on Si(557)
AU - Morikawa, Harumo
AU - Kim, Keun Su
AU - Kitaoka, Yusuke
AU - Hirahara, Toru
AU - Hasegawa, Shuji
AU - Yeom, Han Woong
PY - 2010/7/21
Y1 - 2010/7/21
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.82.045423
DO - 10.1103/PhysRevB.82.045423
M3 - Article
AN - SCOPUS:77956678953
VL - 82
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 1098-0121
IS - 4
M1 - 045423
ER -