Abstract/Details

Bose-Einstein condensation of Strontium-84


2010 2010

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Abstract (summary)

The achievement in 1995 of Bose-Einstein condensates (BEC) in dilute gases of alkali- metal atoms was one of the most important experimental results in recent times. Fifteen years later, the study of quantum fluids is a vibrant field exploring topics such as the effects of dimensionality and disorder on quantum fluids and the modeling of condensed-matter systems with BECs in optical lattices. This thesis describes the achievement of BEC in the alkaline-earth metal atom strontium (Sr). This new addition to the family of elements that have been Bose-condense opens new possibilities, such as the use of an optical Feshbach resonance to tune atom-atom interactions with relatively low atomic losses. Equally exciting theoretical proposals have been made for using quantum fluids made of alkaline-earth metal atoms, like creating exotic quantum magnetism states and demonstrating quantum computation in optical lattices. Previous efforts at achieving BEC with Sr focused on using the most abundant isotopes, 88Sr and 86Sr, without success. This thesis also describes our use of two-photon photoassociation spectroscopy (PAS) for accurate determination of the s-wave scattering length a (a measure of the interaction strength) for all the Sr isotopes and isotope mixtures. This result was essential for determining that bosonic 84Sr possesses the ideal collisional properties for efficient evaporative cooling to quantum degeneracy. 84Sr would not otherwise be the isotope of choice because its natural abundance is very low (0.6%). The PAS results also showed that 88Sr and 86Sr have unfavorable collision properties, which explains the difficulties encountered when attempting to form quantum degenerate 88Sr and 86Sr.

Indexing (details)


Subject
Quantum physics;
Atoms & subatomic particles;
Optics
Classification
0599: Quantum physics
0748: Atoms & subatomic particles
0752: Optics
Identifier / keyword
Pure sciences; Alkaline-earth metals; Atom-atom interactions; Bose-Einstein condensates; Laser cooling; Laser trapping; Optical lattices; Quantum fluids; Strontium isotopes
Title
Bose-Einstein condensation of Strontium-84
Author
Martinez de Escolar, Yenny Natali
Number of pages
170
Publication year
2010
Degree date
2010
School code
0187
Source
DAI-B 71/09, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124203898
Advisor
Killian, Thomas C.
University/institution
Rice University
University location
United States -- Texas
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3421411
ProQuest document ID
750343735
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/750343735
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