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Bulletin of the American Physical Society

Mott Insulator to Superfluid transition with two component bosons

Barbara Capogrosso-Sansone, Marco Guglielmino, Vittorio Penna

Published Mar 15, 2010• 0 citations
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The superfluid--Mott-insulator transition of spin-2 boson atoms with repulsive interaction in an optical lattice in a magnetic field is presented. By using the mean-field theory, the Mott ground states and phase diagrams of the superfluid--Mott-insulator transition at zero temperature are revealed. An applied magnetic field leads to splitting of some phase boundaries. For all the initial Mott ground states containing multiple spin components, different spin components take on different phase boundaries. It is found that in this system phase boundaries with different magnetization can be moved in different ways by changing only the intensity of the applied magnetic field.