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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Topological Matter

Background:

  • Topological control, especially with electron correlations, is crucial for advanced materials.
  • Twisted MoTe2 bilayers are zero-field fractional Chern insulators exhibiting unique quantum Hall effects.
  • Ferromagnetic polarization dictates the properties of Chern insulator states.

Purpose of the Study:

  • To demonstrate optical control of ferromagnetic polarization in twisted MoTe2 bilayers.
  • To investigate the manipulation of Chern insulator (CI) and fractional Chern insulator (FCI) states via optical pumping.
  • To explore applications in topological spintronics and quantum information.

Main Methods:

  • Circularly polarized optical pumping of twisted MoTe2 bilayers.
  • Optical training for on-demand ferromagnetic state preparation.
  • Direct optical switching of magnetization below the Curie temperature.
  • Spatially resolved measurements to map magnetic domains.

Main Results:

  • Achieved on-demand preparation and direct switching of ferromagnetic polarization using helicity-selective optical pumping.
  • Demonstrated dynamic control of CI and FCI states by modulating light helicity.
  • Observed effective optical control near CI and FCI states due to gap-enhanced valley polarization.
  • Successfully performed optical writing of ferromagnetic domains, controlling topological states.

Conclusions:

  • Precise optical control of topological quantum many-body systems is achievable in twisted MoTe2.
  • This method allows for programmable patterning of topological states, enabling new applications.
  • Potential applications include topological spintronics, quantum memories, and the creation of exotic edge states.