The work experimentally creates a phase diagram for excited states, a task that has not been possible with other physical platforms, and shows that spinor Bose-Einstein condensates are a well-controllable system for the study of phases and phase transitions in excited transitions. Using an atomic spin-1 Bose-Einstein condensate, excited quantum states with a controlled, well-defined energy were produced. The phase diagram was introduced by determining an interferometric order parameter mapped to a robust protocol designed to be largely insensitive to magnetic field fluctuations.
The work has now been published in the renowned journal Physical Review Letters and is even featured on the cover.
The publication is also a success for the doctoral programme Hannover School for Nanotechnology (hsn), in which Bernd Meyer-Hoppe and Fabian Anders were involved as doctoral students.
Original articel:
B. Meyer-Hoppe, F. Anders, P. Feldmann, L. Santos, and C. Klempt: Excited-State Phase Diagram of a Ferromagnetic Quantum Gas, Phys. Rev. Lett. 131, 243402 (2023), DOI: 10.1103/PhysRevLett.131.243402
