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Related Experiment Videos

Full counting statistics with spin-sensitive detectors reveals spin singlets.

Antonio Di Lorenzo1, Yuli V Nazarov

  • 1Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands.

Physical Review Letters
|August 11, 2005
PubMed
Summary

We analyzed electric current statistics in multi-terminal systems. High transparency in the source leads to a significant fraction of electrons transferring as spin-singlet pairs.

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Area of Science:

  • Quantum transport phenomena
  • Spin electronics

Background:

  • Understanding electron transport in nanoscale devices is crucial for developing new electronic components.
  • Spin-dependent transport properties offer unique functionalities beyond charge transport.

Purpose of the Study:

  • To investigate the full counting statistics of electric current in a system with multiple drain terminals.
  • To analyze the role of spin-dependent entrance conductances on charge transfer statistics.
  • To determine the nature of charge carriers (single electrons vs. spin-singlet pairs) originating from the source.

Main Methods:

  • Theoretical analysis of full counting statistics.
  • Modeling of electric current flow in multi-terminal systems with spin-polarized contacts.
  • Investigation of transport properties based on source channel transparency.

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Main Results:

  • The statistics of charge transfers can be explained by the simultaneous transport of individual electrons and spin-singlet pairs from the source.
  • A significant fraction of electrons is observed to transfer in spin-singlet pairs when the source exhibits high transparency transport channels.
  • Spin-dependent conductances at the entrance influence the observed charge transfer statistics.

Conclusions:

  • The presence of spin-singlet pairs in electron transport is a key feature in systems with high-transparency source channels.
  • Full counting statistics provide insights into the quantum nature of charge carriers in mesoscopic systems.
  • Spin-singlet pair transport can be a dominant mechanism in specific electronic configurations.