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Probing ultrafast spin dynamics with optical pump-probe scanning tunnelling microscopy.

Shoji Yoshida1, Yuta Aizawa1, Zi-han Wang1

  • 1Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8571, Japan.

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|July 1, 2014
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Summary

This study introduces optical pump-probe scanning tunnelling microscopy for nanoscale spin dynamics. The technique successfully observed spin relaxation and precession in a quantum well with high spatial and temporal resolution.

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Area of Science:

  • Condensed Matter Physics
  • Nanoscience
  • Quantum Dynamics

Background:

  • Spin dynamics in low-dimensional systems are crucial for fundamental science and technology.
  • Spin-polarized scanning tunnelling microscopy (SP-STM) is vital for characterizing localized spin dynamics at the nanoscale.
  • Advancing nanoscale analysis of ultrafast itinerant magnetism and localized characteristics is needed for quantum dynamics research.

Purpose of the Study:

  • To develop and demonstrate an optical pump-probe scanning tunnelling microscopy technique.
  • To enable nanoscale probing of spin dynamics with high temporal resolution.
  • To investigate ultrafast spin dynamics in functional nanostructures.

Main Methods:

  • Utilizing an optical pump-probe scanning tunnelling microscopy (SP-STM) setup.
  • Optically orienting spins using circularly polarized light.
  • Probing spin dynamics via SP-STM synchronized with optical pulses.

Main Results:

  • Achieved nanoscale spatial resolution (∼1 nm) and high temporal resolution for spin dynamics.
  • Observed spin relaxation dynamics in a 6 nm single quantum well.
  • Successfully detected spin precession, enabling Landé g-factor estimation.

Conclusions:

  • The developed optical pump-probe SP-STM technique offers unprecedented capabilities for studying ultrafast spin dynamics at the nanoscale.
  • This method advances the investigation of quantum dynamics in functional nanomaterials.
  • The technique provides insights into spin relaxation and precession, crucial for spintronic applications.