Two-dimensional interaction of spin chains in the Si(553)-Au nanowire system

Hafke, B.; Frigge, T.; Witte, Thomas; Krenzer, B.; Aulbach, J.; Schäfer, J.; Claessen, R.; Erwin, Steven C.; Hoegen, M. Horn‐von

doi:10.1103/physrevb.94.161403

Cited by 39 publications

(79 citation statements)

References 37 publications

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“…The ×2 streaks for the (553)Si-Au are ascribed to the double periodicity within the gold chains along the [110]direction [23,31], whereas the ×2 streaks seen for Si(557)-Au surface originate from the Si adatoms [2,33,34]. For Si(553)-Au, superstructure formation along and between the wires sets in upon cooling [3,35], which is not of further interest for our experiments performed at 300 K. Nonetheless, its absence at 300 K is indicative for a low concentration of missing Au atoms [7].…”

Section: Resultsmentioning

confidence: 99%

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Tuning the conductivity along atomic chains by selective chemisorption

et al. 2017

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Adsorption of Au on vicinal Si(111) surfaces results in growth of long-range ordered metallic quantum wires. In this paper, we utilized site-specific and selective adsorption of oxygen to modify chemically the transport via different channels in the systems Si(553)-Au and Si(557)-Au. They were analyzed by electron diffraction and four-tip STM-based transport experiments. Modeling of the adsorption process by density functional theory shows that the adatoms and rest atoms on Si(557)-Au provide energetically favored adsorption sites, which predominantly alter the transport along the wire direction. Since this structural motif is missing on Si(553)-Au, the transport channels remain almost unaffected by oxidation.

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Section: Resultsmentioning

confidence: 99%

“…Among others, Au-induced arrays of wires on vicinal Si(111) substrates [Si(hhk) in the following] attracted considerable interest recently since the strong spin-orbit coupling gives rise to spin-polarized surface bands. In case of Si(553)-Au, even spin-ordering phenomena are reported yielding a spin-liquid behavior [2,3].…”

Section: Introductionmentioning

confidence: 99%

Tuning the conductivity along atomic chains by selective chemisorption

et al. 2017

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“…Two fully occupied sp 3 hybridized dbs alternate with one empty p orbital of sp 2 hybridized Si in the ground state (2,2,0) electron configuration [20]. This ×3 periodicity together with a ×2 periodicity due to Au chain dimerization is seen by scanning tunneling microscopy (STM) [17,[21][22][23] and low-energy electron diffraction (LEED) [24]. Thermal excitation leads to a sudden conductivity increase along the step edge at around 65 K. Further temperature increase quenches first the ×3, and, subsequently, the ×2 periodicity [25].…”

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confidence: 89%

Vibration-Driven Self-Doping of Dangling-Bond Wires on Si(553)-Au Surfaces

et al. 2020

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Density-functional theory is used to explore the Si(553)-Au surface dynamics. Our study (i) reveals a complex two-stage order-disorder phase transition where with rising temperature first the ×3 order along the Si step edges and, subsequently, the ×2 order of the Au chains is lost, (ii) identifies the transient modification of the electron chemical potential during soft Au chain vibrations as instrumental for disorder at the step edge, and (iii) shows that the transition leads to a self-doping of the Si dangling-bond wire at the step edge. The calculations are corroborated by Raman measurements of surface phonon modes and explain previous electron diffraction, scanning tunneling microscopy, and surface transport data.

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“…For instance, rare‐earth or transition metals form partially embedded silicide wires . Submonolayer coverages of Au on vicinal Si(111) exchange with Si‐surface atoms forming long range ordered atomic chains with metallic Rashba‐split surface bands . On the other hand, metals like Ag or Pb evaporated on Si(557) do not intermix with silicon but form densely‐packed layers covalently bonded to the top layer of the substrate .…”

Section: Introductionmentioning

confidence: 99%

Formation of Sn‐Induced Nanowires on Si(557)

Jäger

Pfnür

Fanciulli

et al. 2019

Physica Status Solidi (b)

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In this study, the growth of Sn on Si(557) surfaces by means of scanning tunneling microscopy, low energy electron diffraction and angle resolved photoemission is analyzed. Depending on the Sn submonolayer coverage, various Sn-nanowires are identified. For Sn-coverages above 0.5 ML,)-reconstructions are found. In particular, these phases cover extended (111)-areas, thus leading to an inhomogeneous refacetting of the Si(557) surface. The (223)-facets between the mini-(111) terraces reveal structures, which resemble a Â2 reconstruction along edges. The initial step structure of the Si(557) surface is maintained for Sncoverages below 0.5 ML, showing the α-Sn phase on 3 nm wide (111)terraces. In contrast to the 2D Mott state of α-Sn/Si(111), this confinement seems to quench the correlated electronic phase yielding metallic surface states at 40 K, in accordance with photoemission.

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Two-dimensional interaction of spin chains in the Si(553)-Au nanowire system

Cited by 39 publications

References 37 publications

Tuning the conductivity along atomic chains by selective chemisorption

Tuning the conductivity along atomic chains by selective chemisorption

Vibration-Driven Self-Doping of Dangling-Bond Wires on Si(553)-Au Surfaces

Formation of Sn‐Induced Nanowires on Si(557)

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