Magnetic relaxation in dysprosium-dysprosium collisions
The collisional magnetic reorientation rate constant gR is measured for magnetically trapped atomic dysprosium (Dy), an atom with large magnetic dipole moments. Using buffer gas cooling with cold helium, large numbers (>1011) of Dy are loaded into a magnetic trap and the buffer gas is subsequentl...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/64460 https://orcid.org/0000-0002-8886-9020 https://orcid.org/0000-0001-9769-2418 |
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| author | Newman, Bonna Kay Brahms, Nathan Au, Yat Shan Johnson, Cort Connolly, Colin B. Doyle, John M. Kleppner, Daniel Greytak, Thomas J. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Newman, Bonna Kay Brahms, Nathan Au, Yat Shan Johnson, Cort Connolly, Colin B. Doyle, John M. Kleppner, Daniel Greytak, Thomas J. |
| author_sort | Newman, Bonna Kay |
| collection | MIT |
| description | The collisional magnetic reorientation rate constant gR is measured for magnetically trapped atomic dysprosium (Dy), an atom with large magnetic dipole moments. Using buffer gas cooling with cold helium, large numbers (>1011) of Dy are loaded into a magnetic trap and the buffer gas is subsequently removed. The decay of the trapped sample is governed by collisional reorientation of the atomic magnetic moments. We find gR=1.9±0.5×10-11 cm3 s-1 at 390 mK. We also measure the magnetic reorientation rate constant of holmium (Ho), another highly magnetic atom, and find gR=5±2×10-12 cm3 s-1 at 690 mK. The Zeeman relaxation rates of these atoms are greater than expected for the magnetic dipole-dipole interaction, suggesting that another mechanism, such as an anisotropic electrostatic interaction, is responsible. Comparison with estimated elastic collision rates suggests that Dy is a poor candidate for evaporative cooling in a magnetic trap. |
| first_indexed | 2024-09-23T11:13:03Z |
| format | Article |
| id | mit-1721.1/64460 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T11:13:03Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/644602022-10-01T02:07:27Z Magnetic relaxation in dysprosium-dysprosium collisions Newman, Bonna Kay Brahms, Nathan Au, Yat Shan Johnson, Cort Connolly, Colin B. Doyle, John M. Kleppner, Daniel Greytak, Thomas J. Massachusetts Institute of Technology. Department of Physics MIT-Harvard Center for Ultracold Atoms Greytak, Thomas J. Greytak, Thomas J. Newman, Bonna Kay Johnson, Cort Brahms, Nathan Au, Yat Shan Connolly, Colin B. Doyle, John M. Kleppner, Daniel The collisional magnetic reorientation rate constant gR is measured for magnetically trapped atomic dysprosium (Dy), an atom with large magnetic dipole moments. Using buffer gas cooling with cold helium, large numbers (>1011) of Dy are loaded into a magnetic trap and the buffer gas is subsequently removed. The decay of the trapped sample is governed by collisional reorientation of the atomic magnetic moments. We find gR=1.9±0.5×10-11 cm3 s-1 at 390 mK. We also measure the magnetic reorientation rate constant of holmium (Ho), another highly magnetic atom, and find gR=5±2×10-12 cm3 s-1 at 690 mK. The Zeeman relaxation rates of these atoms are greater than expected for the magnetic dipole-dipole interaction, suggesting that another mechanism, such as an anisotropic electrostatic interaction, is responsible. Comparison with estimated elastic collision rates suggests that Dy is a poor candidate for evaporative cooling in a magnetic trap. National Science Foundation (U.S.) (Grant No. PHY-0757157) 2011-06-16T17:46:14Z 2011-06-16T17:46:14Z 2011-01 2010-12 Article http://purl.org/eprint/type/JournalArticle 1050-2947 http://hdl.handle.net/1721.1/64460 Newman, Bonna Kay et al. "Magnetic relaxation in dysprosium-dysprosium collisions." Phys. Rev. A 83, 012713 (2011) [5 pages] © 2011 American Physical Society. https://orcid.org/0000-0002-8886-9020 https://orcid.org/0000-0001-9769-2418 en_US http://dx.doi.org/10.1103/PhysRevA.83.012713 Physical Review A Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Newman, Bonna Kay Brahms, Nathan Au, Yat Shan Johnson, Cort Connolly, Colin B. Doyle, John M. Kleppner, Daniel Greytak, Thomas J. Magnetic relaxation in dysprosium-dysprosium collisions |
| title | Magnetic relaxation in dysprosium-dysprosium collisions |
| title_full | Magnetic relaxation in dysprosium-dysprosium collisions |
| title_fullStr | Magnetic relaxation in dysprosium-dysprosium collisions |
| title_full_unstemmed | Magnetic relaxation in dysprosium-dysprosium collisions |
| title_short | Magnetic relaxation in dysprosium-dysprosium collisions |
| title_sort | magnetic relaxation in dysprosium dysprosium collisions |
| url | http://hdl.handle.net/1721.1/64460 https://orcid.org/0000-0002-8886-9020 https://orcid.org/0000-0001-9769-2418 |
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