Melting of Discrete Vortices via Quantum Fluctuations

Details Melting of Discrete Vortices via Quantum Fluctuations Melting of Discrete Vortices via Quantum Fluctuations

2006-07-11

arxiv.org/abs/cond-mat/0607297v2

Phys. Rev. Lett. 97, 180408 (2006)

Physics

Condensed Matter

Other Condensed Matter

Revised version, 4 pages, 5 figures, Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.97.180408

We consider nonlinear boson states with a nontrivial phase structure in the three-site Bose-Hubbard ring, {\em quantum discrete vortices} (or {\em q-vortices}), and study their "melting" under the action of quantum fluctuations. We calculate the spatial correlations in the ground states to show the superfluid-insulator crossover and analyze the fidelity between the exact and variational ground states to explore the validity of the classical analysis. We examine the phase coherence and the effect of quantum fluctuations on q-vortices and reveal that the breakdown of these coherent structures through quantum fluctuations accompanies the superfluid-insulator crossover.

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