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Area of Science:

  • Quantum Matter Physics
  • Condensed Matter Physics
  • Materials Science

Background:

  • Optical control of quantum matter offers dynamic tuning of properties like band topology and superconductivity.
  • Achieving steady-state optical control in strongly correlated electron systems remains a challenge.

Purpose of the Study:

  • To demonstrate optical switching of the spin-valley degree of freedom in twisted MoTe2 (t-MoTe2) homobilayers.
  • To investigate the dynamic control of strongly correlated phases, including Chern insulators and ferromagnetic metals.

Main Methods:

  • Utilized twisted MoTe2 (t-MoTe2) homobilayers with flat valley-contrasting Chern bands.
  • Employed resonant excitation of exciton-polaron transitions with circularly polarized light.

Main Results:

  • Successfully demonstrated optical switching of the spin-valley orientation in various strongly correlated phases.
  • Showcased dynamic reversal of ferromagnetic spin states without an external magnetic field.
  • Provided evidence for dynamical control over a topological order parameter.

Conclusions:

  • Non-thermal optical switching of ferromagnetic spin states is achievable.
  • Dynamical control of topological order parameters is possible, enabling new quantum technologies.
  • Paved the way for optical generation of chiral edge modes and topological quantum circuits.