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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Spin Chains and Electron Transfer at Stepped Silicon Surfaces.

J Aulbach1, S C Erwin2, R Claessen1

  • 1Physikalisches Institut and Röntgen Center for Complex Material Systems (RCCM), Universität Würzburg , D-97074 Würzburg, Germany.

Nano Letters
|March 15, 2016
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Summary
This summary is machine-generated.

Silicon surfaces with gold exhibit unique spin chains. Researchers found Si(775)-Au surfaces lack spin polarization, unlike related structures, and propose a model to control these magnetic moments.

Keywords:
Spin chainsatomic wirescharge orderingdefect dopingdensity functional theoryscanning tunneling spectroscopy

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Area of Science:

  • Surface Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • High-index silicon surfaces with adsorbed gold reconstruct into ordered linear step arrays.
  • Specific surfaces like Si(553)-Au and Si(557)-Au exhibit spin-polarized, charge-ordered silicon atoms at step edges, forming "spin chains."

Purpose of the Study:

  • To investigate the spin polarization at the step edge of the Si(775)-Au surface.
  • To develop a theoretical model explaining the differences in spin polarization among related Si(hhk)-Au surfaces.
  • To explore methods for creating and controlling silicon spin chains.

Main Methods:

  • Theoretical calculations using density-functional theory (DFT).
  • Experimental verification using scanning tunneling microscopy (STM).
  • Development of an electron-counting model to explain surface behavior.

Main Results:

  • The Si(775)-Au surface shows no spin polarization at its step edge, contrasting with Si(553)-Au and Si(557)-Au.
  • An electron-counting model successfully explains the observed differences in spin polarization.
  • The model predicts that defects and dopants can induce local spin moments at Si(hhk)-Au step edges.

Conclusions:

  • The spin polarization of Si(hhk)-Au step edges is sensitive to subtle structural and electronic differences.
  • Surface chemistry and atom manipulation can be utilized to engineer silicon spin chains.
  • This research provides a pathway for creating controllable magnetic nanostructures on silicon.