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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Excitons, or coupled electron-hole pairs, are fundamental quasiparticles in semiconductors.
  • Collective states of excitons can exhibit unique nonlinear optical properties.

Purpose of the Study:

  • To experimentally demonstrate and characterize a collective fluid-like state of excitons in molybdenum disulfide (MoS2).
  • To investigate the conditions under which this exciton fluid behavior emerges and its transport properties.

Main Methods:

  • Utilizing photoluminescence spectroscopy to observe exciton propagation in atomically thin MoS2.
  • Conducting experiments with hexagonal-boron-nitride-encapsulated MoS2 devices.
  • Performing theoretical simulations to understand momentum conservation and local equilibrium.

Main Results:

  • Observed exciton fluid propagation over distances of at least 60 μm at speeds of ~1.8 × 10^7 m/s.
  • The collective phase emerges above a critical laser power and below a critical temperature (Tc ≈ 150 K).
  • Exciton fluid behavior is independent of crystallographic defects and geometric constraints, indicating robust collective dynamics.

Conclusions:

  • Experimental evidence supports the description of exciton transport as a classical fluid.
  • Momentum conservation and local equilibrium are key features enabling this fluid dynamics behavior.
  • The findings open new avenues for exploring quantum fluid phenomena in atomically thin materials.