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Researchers created an electrically controlled fluid of trions (three-particle complexes) in van der Waals heterostructures. This platform allows tuning between exciton and trion fluids, offering new insights into quantum correlated phases.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Materials Science

Background:

  • Quantum electron-hole (e-h) fluids exhibit complex correlated phases due to Coulomb interactions.
  • Excitons, trions, and biexcitons are examples of multiparticle charge complexes.
  • Van der Waals heterostructures provide a platform for studying novel quantum phenomena.

Purpose of the Study:

  • To experimentally realize and investigate an electrically controlled interlayer trion fluid.
  • To explore the tunable nature of correlated phases in e-h bilayers.
  • To demonstrate a platform for studying Bose-Fermi mixtures.

Main Methods:

  • Fabrication of van der Waals heterostructures.
  • Utilizing electrostatic gating for electrical control.
  • Spectroscopic analysis of electron-hole interactions and bound states.

Main Results:

  • Spontaneous formation of three-particle trion bound states (1e-2h and 2e-1h) in strongly coupled e-h bilayers.
  • Observation of a spin-singlet configuration in 1e-2h trions with a spin gap of ~1 meV.
  • Continuous tuning of the system into exciton fluid, trion fluid, exciton-trion mixtures, or trion-charge mixtures via electrostatic gating.

Conclusions:

  • An electrically tunable interlayer trion fluid has been experimentally realized.
  • This system serves as a versatile platform for investigating correlated quantum phases.
  • The ability to tune between different fluid phases opens avenues for studying Bose-Fermi mixtures.