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Title: Robustness of discrete semifluxons in closed Bose-Hubbard chains
Author: Gallemí Camacho, Albert
Guilleumas, Montserrat
Martorell Domenech, Juan
Mayol Sánchez, Ricardo
Polls Martí, Artur
Juliá-Díaz, Bruno
Keywords: Teoria quàntica
Control de robustesa
Quantum theory
Robust control
Issue Date: 6-Jul-2016
Publisher: IOP Publishing
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 π-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.
Note: Reproducció del document publicat a:
It is part of: New Journal of Physics, 2016, vol. 18, num. 7, p. 075005
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ISSN: 1367-2630
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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