Document type
Master thesisPublication date
Publication license
Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/59962
Cold bosons in optical lattices: an exact diagonalization study
Journal Title
Authors
Director/Tutor
Journal ISSN
Volume Title
Related resource
Abstract
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.
Description
Màster Oficial en Física Avançada, Facultat de Física, Universitat de Barcelona, Curs: 2014, Tutor: Bruno Julià Díaz
Subject (English)
Citation
Collections
Citation
RAVENTÓS I RIBERA, David. Cold bosons in optical lattices: an exact diagonalization study. [consulted: 12 of June of 2026]. Available at: https://hdl.handle.net/2445/59962