Scanning tunneling microscopy observation of Pb-induced superstructures on Si(557)

Harumo Morikawa, Keun Su Kim, Duk Yong Jung, Han Woong Yeom

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Pb-induced superstructures on Si(557) are investigated by low-energy-electron diffraction (LEED) and scanning tunneling microscopy (STM). Using an indirect heating method, we have succeeded in obtaining almost perfect single-domain LEED patterns of one-dimensional wire (chain) structures, so called α×2 and β×2 phases. Careful LEED analysis and STM investigation reveal that these phases are formed on the (223) and (112) facets, respectively. The α×2 phase has regular bundles of triple wires at low annealing temperature but wider bundles through step bunching after a higher temperature annealing. Along the wires of the α×2 phase, which was recently reported to exhibit a transition between one-dimensional (1D) metallic and 2D semiconducting conductance, a clear commensurate ×2 modulation is observed at 78-120 K in contrast to the incommensurate and disordered structure reported previously. A tentative atomic structure model of the α×2 phase is proposed based on the dense Pb overlayers on (111) and (223) facets. The details of the STM images of the β×2 phase are discussed.

Original languageEnglish
Article number165406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number16
DOIs
Publication statusPublished - 2007 Oct 5

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Low energy electron diffraction
Scanning tunneling microscopy
scanning tunneling microscopy
electron diffraction
wire
Wire
bundles
flat surfaces
Annealing
annealing
bunching
atomic structure
Diffraction patterns
energy
diffraction patterns
Modulation
modulation
Heating
Temperature
heating

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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abstract = "Pb-induced superstructures on Si(557) are investigated by low-energy-electron diffraction (LEED) and scanning tunneling microscopy (STM). Using an indirect heating method, we have succeeded in obtaining almost perfect single-domain LEED patterns of one-dimensional wire (chain) structures, so called α×2 and β×2 phases. Careful LEED analysis and STM investigation reveal that these phases are formed on the (223) and (112) facets, respectively. The α×2 phase has regular bundles of triple wires at low annealing temperature but wider bundles through step bunching after a higher temperature annealing. Along the wires of the α×2 phase, which was recently reported to exhibit a transition between one-dimensional (1D) metallic and 2D semiconducting conductance, a clear commensurate ×2 modulation is observed at 78-120 K in contrast to the incommensurate and disordered structure reported previously. A tentative atomic structure model of the α×2 phase is proposed based on the dense Pb overlayers on (111) and (223) facets. The details of the STM images of the β×2 phase are discussed.",
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Scanning tunneling microscopy observation of Pb-induced superstructures on Si(557). / Morikawa, Harumo; Kim, Keun Su; Jung, Duk Yong; Yeom, Han Woong.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 76, No. 16, 165406, 05.10.2007.

Research output: Contribution to journalArticle

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