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Interferometric Order Parameter for Excited-State Quantum Phase Transitions in Bose-Einstein Condensates

Abstract : Excited-state quantum phase transitions extend the notion of quantum phase transitions beyond the ground state. They are characterized by closing energy gaps amid the spectrum. Identifying order parameters for excited-state quantum phase transitions poses, however, a major challenge. We introduce a topological order parameter that distinguishes excited-state phases in a large class of mean-field models and can be accessed by interferometry in current experiments with spinor Bose-Einstein condensates. Our work opens a way for the experimental characterization of excited-state quantum phases in atomic many-body systems.
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Submitted on : Tuesday, October 12, 2021 - 11:39:46 AM
Last modification on : Friday, December 3, 2021 - 11:43:18 AM

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Polina Feldmann, Carsten Klempt, Augusto Smerzi, Luis Santos, Manuel Gessner. Interferometric Order Parameter for Excited-State Quantum Phase Transitions in Bose-Einstein Condensates. Physical Review Letters, American Physical Society, 2021, 126 (23), ⟨10.1103/PhysRevLett.126.230602⟩. ⟨hal-03374664⟩

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