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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Moiré effects in 2D crystals create novel quantum materials with unique phenomena due to atomic registry modulations.
  • Finite elasticity can cause superlattices to transition from moiré patterns to reconstructed lattices.

Purpose of the Study:

  • To investigate nanoscale lattice reconstruction at the mesoscopic scale in laterally extended samples.
  • To demonstrate the consequences of mesoscopic reconstruction on exciton properties in MoSe2-WSe2 heterostructures.

Main Methods:

  • Optical studies of excitons in MoSe2-WSe2 heterostructures with parallel and antiparallel alignments.
  • Analysis of mesoscopic reconstruction in van der Waals heterostructures with small twist angles.

Main Results:

  • Identified domains with distinct effective dimensionality for moiré excitons.
  • Established mesoscopic reconstruction as a key feature in real samples, influenced by finite size and disorder.
  • Demonstrated rich optical phenomena arising from mesoscale domain formation.

Conclusions:

  • Mesoscopic reconstruction unifies the understanding of moiré excitons in near-commensurate semiconductor heterostructures.
  • This concept, applicable to other 2D material stacks, expands understanding of van der Waals heterostructures.
  • Emergent topological defects and percolation networks in mesoscale domains offer new insights into electronic, optical, and magnetic properties.