Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2009
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| Online Access: | http://hdl.handle.net/1721.1/45435 |
| _version_ | 1826196562091442176 |
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| author | Mun, Jongchul |
| author2 | Wolfgang Ketterle and David E. Pritchard. |
| author_facet | Wolfgang Ketterle and David E. Pritchard. Mun, Jongchul |
| author_sort | Mun, Jongchul |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008. |
| first_indexed | 2024-09-23T10:29:31Z |
| format | Thesis |
| id | mit-1721.1/45435 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T10:29:31Z |
| publishDate | 2009 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/454352019-04-12T09:33:31Z Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition BECs in optical lattices : the superfluid to Mott insulator phase transition Mun, Jongchul Wolfgang Ketterle and David E. Pritchard. Massachusetts Institute of Technology. Dept. of Physics. Massachusetts Institute of Technology. Dept. of Physics. Physics. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2008. Includes bibliographical references (p. 167-172). 87Rb Bose Einstein Condensate in 3D optical lattice was studied in the regime of weak interaction(the superfluid phase) and strong interaction(the Mott insulating phase). The stability of superfluid currents was studied using a moving optical lattice. The critical momentum for stable superfluid current varies from 0.5 recoil momentum (shallow lattice) to 0 (the Mott insulator) as the system reaches the Mott insulator transition. The phase diagram for the disappearance of superfluidity was studied as a function of momentum and lattice depth. Our phase diagram boundary extrapolates to the critical lattice depth for the superfluid-to-MI transition. When a one-dimensional gas was loaded into a moving optical lattice a sudden broadening of the transition between stable and unstable phases was observed. A new auxiliary vacuum chamber, which is called the science chamber, was designed and installed to improve optical lattice experimental performance and imaging resolution power. Atoms are transported from the main chamber to the science chamber. By further evaporation cooling, BECs with N - 2-3 x 104 atoms are produced in a combination trap of two focused IR laser beams. High-resolution imaging was obtained with a 4-lens stack providing a resolution of - 2pm. The deep Mott insulator(MI) phase was studied using clock shift spectroscopy. Individual MI phases with integer occupation numbers could be addressed through their clock shifts, and their spatial density profile could be imaged ("shell structure"). With increasing trap depth, MI shells expanded from low to high density regions of the cloud. by Jongchul Mun. Ph.D. 2009-04-29T17:41:46Z 2009-04-29T17:41:46Z 2008 2008 Thesis http://hdl.handle.net/1721.1/45435 317950934 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 177 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Physics. Mun, Jongchul Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition |
| title | Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition |
| title_full | Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition |
| title_fullStr | Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition |
| title_full_unstemmed | Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition |
| title_short | Bose-Einstein condensates in optical lattices : the superfluid to Mott insulator phase transition |
| title_sort | bose einstein condensates in optical lattices the superfluid to mott insulator phase transition |
| topic | Physics. |
| url | http://hdl.handle.net/1721.1/45435 |
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