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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/59962
Cold bosons in optical lattices: an exact diagonalization study
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Experimental setups of cold atoms in optical lattices reproduce several quantum
many-particle models, including the Bose-Hubbard model. We study this model by means of exact
diagonalization. This model carries a super uid to Mott insulator quantum phase transition. In
order to characterize the phase transition, we have computed the ground state of the system and
its overlap with the analytic expressions for the Mott insulator and super uid states, its one-body
density matrix, and its Von Neumann entropy. We have also studied the e ect of setting an attractive
bias potential in one site of the lattice at di erent strengths and also the strongly biased case in the
repulsive regime. Finally, we have also explored the case with attractive on-site interactions, nding
correlated states in the weakly attractive regime.
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Màster Oficial en Física Avançada, Facultat de Física, Universitat de Barcelona, Curs: 2014, Tutor: Bruno Julià Díaz
Matèries (anglès)
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RAVENTÓS I RIBERA, David. Cold bosons in optical lattices: an exact diagonalization study. [consulted: 14 of August of 2026]. Available at: https://hdl.handle.net/2445/59962