Photons, Magnons and Quantum Technologies – Many-body systems

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  • Permanent member: François Dubin
  • Researcher Emeritus: Monique Combescot

Composite bosons model systems like excitons in semiconductor heterostructures are also investigated. After the demonstration of Bose-Einstein condensation with indirect excitons in our group, the different quantum phases of collective states in two dimensions are explored through the Berezinskii-Kosterlitz-Thouless transition. These experiments are closely related to theoretical developments using a new many-body formalism for composite bosons and its Shiva diagrammatic representation. This formalism can be extended to different fields and a natural application is to cold quantum gazes in which the particles’ composite nature has been neglected till now.



  • C Lagoin, S Suffit, K West, K Baldwin, L Pfeiffer, M Holzmann, F Dubin. Quasicondensation of Bilayer Excitons in a Periodic Potential. Physical Review Letters 126 (6), 067404, (2021)
  • C Lagoin, F Dubin. Key role of the moiré potential for the quasicondensation of interlayer excitons in van der Waals heterostructures. Physical Review B 103 (4), L041406 (2021)
  • C Lagoin, S Suffit, M Bernard, M Vabre, K West, K Baldwin, L Pfeiffer. Microscopic lattice for two-dimensional dipolar excitons. Physical Review B 102 (24), 245428, (2020)
  • Suzanne Dang, Marta Zamorano, Stephan Suffit, Kenneth West, Kirk Baldwin, et al.. Observation of algebraic time order for two-dimensional dipolar excitons. Physical Review Research, American Physical Society, 2020, 2 (3), ⟨10.1103/PhysRevResearch.2.032013⟩. ⟨hal-03015496⟩
  • Suzanne Dang, Romain Anankine, Carmen Gomez, Aristide Lemaître, Markus Holzmann, et al.. Defect Proliferation at the Quasicondensate Crossover of Two-Dimensional Dipolar Excitons Trapped in Coupled GaAs Quantum Wells. Physical Review Letters, American Physical Society, 2019, 122 (11), ⟨10.1103/PhysRevLett.122.117402⟩. ⟨hal-02325689⟩
  • Romain Anankine, Suzanne Dang, Mussie Beian, Edmond Cambril, Carmen Gomez Carbonell, et al.. Temporal coherence of spatially indirect excitons across Bose–Einstein condensation: the role of free carriers. New Journal of Physics, Institute of Physics: Open Access Journals, 2018, 20 (7), pp.073049. ⟨10.1088/1367-2630/aad30a⟩. ⟨hal-03015127⟩