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Area of Science:

  • Condensed matter physics
  • Quantum matter
  • Ultrafast spectroscopy

Background:

  • Nonequilibrium quantum matter generated by ultrafast laser light offers new pathways in fundamental physics.
  • Tailoring matter by light provides rich control possibilities.

Purpose of the Study:

  • To explore the coupling between free carriers and excitons mediated by femtosecond-scale laser pulses.
  • To investigate the influence of resonant laser light on early-time free-carrier population and exciton dynamics.

Main Methods:

  • Employed monolayer WSe2.
  • Utilized an ab initio treatment of pump-probe spectroscopy.

Main Results:

  • Counterintuitively found that laser light resonant with excitons massively enhances early-time free-carrier population.
  • Observed complex dynamical correlation between free carriers and excitons, including persistent oscillatory coupling.
  • Unveiled rich femtosecond dynamics of "femtoexcitons".

Conclusions:

  • Results demonstrate the potential for tailoring early-time light-matter interactions via laser pulse design.
  • Suggests simultaneous control of excitonic and free-carrier physics at ultrafast times is achievable.