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Spin coherence generation and detection in spherical nanocrystals.

D S Smirnov1, M M Glazov

  • 1Ioffe Physical-Technical Institute of the RAS, St-Petersburg 194021, Russia.

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Summary

Electron spin orientation in semiconductor nanocrystals is controlled by optical pulse power and helicity. Periodic optical pulses can achieve complete electron spin alignment and mode-locking, enabling advanced spin manipulation.

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Area of Science:

  • Quantum dots
  • Spintronics
  • Optical physics

Background:

  • Semiconductor nanocrystals offer tunable electronic and optical properties.
  • Electron spin manipulation is crucial for quantum information processing and spintronics.
  • Understanding spin dynamics in nanocrystals requires theoretical models accounting for complex band structures.

Purpose of the Study:

  • To theoretically describe electron spin orientation and detection in semiconductor nanocrystals using optical pulses.
  • To investigate the influence of optical pulse parameters (helicity, power) on spin injection.
  • To explore the potential of optical pulse trains for complete spin orientation and spin signal detection.

Main Methods:

  • Theoretical modeling of electron spin dynamics in singly charged semiconductor nanocrystals.
  • Inclusion of the complex valence band structure of spherical nanocrystals.
  • Development of a microscopic theory for spin Faraday, Kerr, and ellipticity effects.

Main Results:

  • Electron spin orientation direction depends on pump pulse helicity and power.
  • A train of optical pulses can achieve complete resident electron spin orientation.
  • Periodic pumping leads to mode-locking of electron spins, observed as spin signals at negative delays.

Conclusions:

  • Optical pulses provide a versatile tool for controlling and detecting electron spins in nanocrystals.
  • The developed theory accurately describes spin dynamics and predicts observable effects like mode-locking.
  • This work lays the foundation for advanced spintronic applications using semiconductor nanocrystals.