Direct momentum-resolved observation of one-dimensional confinement of externally doped electrons within a single subnanometer-scale wire

Inkyung Song, Dong Hwa Oh, Ha Chul Shin, Sung Joon Ahn, Youngkwon Moon, Sun Hee Woo, Hyoung Joon Choi, Chong Yun Park, Joung Real Ahn

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Cutting-edge research in the band engineering of nanowires at the ultimate fine scale is related to the minimum scale of nanowire-based devices. The fundamental issue at the subnanometer scale is whether angle-resolved photoemission spectroscopy (ARPES) can be used to directly measure the momentum-resolved electronic structure of a single wire because of the difficulty associated with assembling single wire into an ordered array for such measurements. Here, we demonstrated that the one-dimensional (1D) confinement of electrons, which are transferred from external dopants, within a single subnanometer-scale wire (subnanowire) could be directly measured using ARPES. Convincing evidence of 1D electron confinement was obtained using two different gold subnanowires with characteristic single metallic bands that were alternately and spontaneously ordered on a stepped silicon template, Si(553). Noble metal atoms were adsorbed at room temperature onto the gold subnanowires while the overall structure of the wires was maintained. Only one type of gold subnanowire could be controlled using external noble metal dopants without transforming the metallic band of the other type of gold subnanowires. This result was confirmed by scanning tunnelling microscopy experiments and first-principles calculations. The selective control clearly showed that externally doped electrons could be confined within a single gold subnanowire. This experimental evidence was used to further investigate the effects of the disorder induced by external dopants on a single subnanowire using ARPES.

Original languageEnglish
Pages (from-to)281-288
Number of pages8
JournalNano Letters
Volume15
Issue number1
DOIs
Publication statusPublished - 2015 Jan 14

Fingerprint

Momentum
wire
Wire
Gold
momentum
Electrons
gold
Photoelectron spectroscopy
electrons
photoelectric emission
Doping (additives)
Precious metals
noble metals
Nanowires
nanowires
spectroscopy
Scanning tunneling microscopy
Silicon
assembling
adatoms

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Song, Inkyung ; Oh, Dong Hwa ; Shin, Ha Chul ; Ahn, Sung Joon ; Moon, Youngkwon ; Woo, Sun Hee ; Choi, Hyoung Joon ; Park, Chong Yun ; Ahn, Joung Real. / Direct momentum-resolved observation of one-dimensional confinement of externally doped electrons within a single subnanometer-scale wire. In: Nano Letters. 2015 ; Vol. 15, No. 1. pp. 281-288.
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Direct momentum-resolved observation of one-dimensional confinement of externally doped electrons within a single subnanometer-scale wire. / Song, Inkyung; Oh, Dong Hwa; Shin, Ha Chul; Ahn, Sung Joon; Moon, Youngkwon; Woo, Sun Hee; Choi, Hyoung Joon; Park, Chong Yun; Ahn, Joung Real.

In: Nano Letters, Vol. 15, No. 1, 14.01.2015, p. 281-288.

Research output: Contribution to journalArticle

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