Abstract/Details

Quantum Monte Carlo study of ultracold bosons in optical lattices


2008 2008

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Abstract (summary)

In this dissertation I present results for lattice boson systems based on quantum Monte Carlo simulations by the Worm algorithm. Lattice bosons can be realized by ultracold gases in optical lattices and, under certain conditions, they are described by the Bose-Hubbard model. I will discuss the ground state, i.e. the phase diagram and properties of elementary excitations, as well as finite temperature thermodynamic properties of the two- and three-dimensional systems. These results provide bench-marks and guidance for experimentalists. I will also discuss the phase diagram of the one-dimensional hard-core Bose-Hubbard model with three-body interactions. The model is realized by cold polar molecules in optical lattices. The ground state presents a novel solid phase at unconventional filling, characterized by coexisting charge density wave and bond orders. Such phase has not been predicted by the preexisting mean field theory.

Indexing (details)


Subject
Condensed matter physics
Classification
0611: Condensed matter physics
Identifier / keyword
Pure sciences; Mott transition; Optical lattices; Ultracold atoms; Ultracold bosons
Title
Quantum Monte Carlo study of ultracold bosons in optical lattices
Author
Capogrosso-Sansone, Barbara
Number of pages
110
Publication year
2008
Degree date
2008
School code
0118
Source
DAI-B 69/12, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549915669
Advisor
Prokofiev, Nikolay V.
Committee member
Machta, Jonathan L.; Monson, Peter A.; Svistunov, Boris V.
University/institution
University of Massachusetts Amherst
Department
Physics
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3336980
ProQuest document ID
304568092
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304568092
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