Robustness of discrete semifluxons in closed Bose-Hubbard chains

Abstract

We present the properties of the ground state and low-energy excitations of Bose-Hubbard chains with a geometry that varies from open to closed and with a tunable twisted link. In the vicinity of the symmetric $\pi -$flux case the system behaves as an interacting gas of discrete semifluxons for finite chains and interactions in the Josephson regime. The energy spectrum of the system is studied by direct diagonalization and by solving the corresponding Bogoliubov--de Gennes equations. The atom-atom interactions are found to enhance the presence of strongly correlated macroscopic superpositions of semifluxons.

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Cited by in corpus (9)

• Atomtronics-enabled Quantum Technologies
• Tunneling of persistent currents in coupled ring-shaped Bose-Einstein condensates
• Nonlinear waves of Bose-Einstein condensates in rotating ring lattice potentials
• Resonant persistent currents for ultracold bosons on a lattice ring
• Robustness of discrete semifluxons in closed Bose-Hubbard chains
• Blocked populations in ring-shaped optical lattices
• Static properties of two linearly coupled discrete circuits
• Dipolar magnetostirring protocol for three-well atomtronic circuits
• Instability and particle current control of a parametrically driven Bose-Einstein condensate in a ring-shaped lattice