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Adiabatic Preparation of a Fractional Quantum Hall Fluid by Coherently Pumping Atoms from a Bose-Einstein Condensate

Alberto Tabarelli de Fatis1, Christof Weitenberg2, Alexander Schnell3, André Eckardt3, and Iacopo Carusotto1

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Phys. Rev. Lett. 137, 193402 – Published 5 November, 2026

DOI: https://doi.org/10.1103/bmbj-sycw

Abstract

We propose a protocol to adiabatically prepare a many-particle fractional quantum Hall fluid of bosonic ultracold atoms exploiting a time-dependent coherent coupling of a strongly interacting atomic state with a large dilute Bose-Einstein condensate. Starting from an empty cloud, atoms with well-defined angular momentum are coherently pumped into the fluid by Raman beams with a Laguerre-Gauss profile. Compared to number-conserving schemes which rely on finite-size-induced gaps, we identify an adiabatic path in the Fock space which avoids crossing fixed-particle-number phase transitions and maintains a sizable and externally controlled adiabatic gap open at all times. The efficiency of our preparation protocol is numerically assessed for typical experimental parameters up to particle numbers that largely exceed the experimental state of the art. The crucial advantage of including an anharmonic confinement is finally highlighted.

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Phys. Rev. Lett. 137, 193402– Published 5 November, 2026
  • Received 21 June 2026
  • Revised 18 September 2026
  • Accepted 8 October 2026
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