Dual-density waves with neutral and charged dipolar excitons of GaAs bilayers

Camille Lagoin, Stephan Suffit, Kirk Baldwin, Loren Pfeiffer, François Dubin

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Strongly correlated quantum particles in lattice potentials are the building blocks for a wide variety of quantum insulators—for instance, Mott phases and density waves breaking lattice symmetry1–3. Such collective states are accessible to bosonic and fermionic systems2,4–10,11,12. To expand further the spectrum of accessible quantum matter phases, mixing both species is theoretically appealing because density order then competes with phase separation13–16. Here we manipulate such a Bose–Fermi mixture by confining neutral (boson-like) and charged (fermion-like) dipolar excitons in an artificial square lattice of a GaAs bilayer. At unitary lattice filling, strong inter- and intraspecies interactions stabilize insulating phases when the fraction of charged excitons is around (1/3, 1/2, 2/3). We evidence that dual Bose–Fermi density waves are then realized, with species ordered in alternating stripes. Our observations highlight that dipolar excitons allow for controlled implementations of Bose–Fermi Hubbard models extended by off-site interactions.

Original languageEnglish (US)
Pages (from-to)170-174
Number of pages5
JournalNature Materials
Issue number2
StatePublished - Feb 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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