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arXiv · 1810.03331

Nonclassical states in strongly correlated bosonic ring ladders

Nicolas Victorin·Tobias Haug·Leong-Chuan Kwek·Luigi Amico·Anna Minguzzi
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Abstract

We study the ground state of a bosonic ring ladder under a gauge flux in the vortex phase, corresponding to the case where the single-particle dispersion relation has two degenerate minima. By combining exact diagonalization and an approximate fermionization approach we show that the ground state of the system evolves from a fragmented state of two single-particle states at weak interparticle interactions to a fragmented state of two Fermi seas at large interactions. Fragmentation is inferred from the study of the eigenvalues of the reduced single-particle density matrix as well as from the calculation of the fidelity of the states. We characterize these nonclassical states by the momentum distribution, the chiral currents and the current-current correlations.

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Nicolas Victorin, Tobias Haug, Leong-Chuan Kwek, Luigi Amico, Anna Minguzzi. 2018-10-08. Nonclassical states in strongly correlated bosonic ring ladders. https://doi.org/10.1103/physreva.99.033616

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