Universal free-fermion multiply-excited eigenstates and their experimental signatures in 1D arrays of two-level atoms

Yu-Xiang Zhang, Klaus Mølmer

Research output: Working paper/Preprint Preprint

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One-dimensional subwavelength atom arrays display multiply-excited subradiant eigenstates which are reminiscent of free fermions. In this Letter, we show that such free-fermion eigenstates appear in case of a quadratic dispersion relation of the band of singly-excited states, by demonstrating that near the band-edge, Hamiltonians of the long-range resonant dipole-dipole interactions can be approximated by a nearest-neighbour-tunneling model diagonalized by Jordan-Wigner fermions. The universal mechanism for this phenomenon implies that the free-fermion ansatz extends to states with finite decay rates and we propose schemes for their observation, exploiting a physical transfer process between sub- and super-radiant free-fermion eigenstates, and by angular coincidences in the emission from a laser driven atomic array.
Original languageUndefined/Unknown
Publication statusPublished - 9 Sept 2021

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