Title:
Spin-1 atomic condensates in magnetic fields
Spin-1 atomic condensates in magnetic fields
| dc.contributor.advisor | You, Li | |
| dc.contributor.author | Zhang, Wenxian | en_US |
| dc.contributor.committeeMember | Chandra Raman | |
| dc.contributor.committeeMember | Chou, Mei-Yin | |
| dc.contributor.committeeMember | Chapman, Michael S. | |
| dc.contributor.committeeMember | Z. John Zhang | |
| dc.contributor.department | Physics | en_US |
| dc.date.accessioned | 2006-01-18T22:16:20Z | |
| dc.date.available | 2006-01-18T22:16:20Z | |
| dc.date.issued | 2005-09-22 | en_US |
| dc.description.abstract | In this thesis we investigate the static, dynamic, and thermodynamic properties of atomic spin-1 Bose gases in external magnetic fields. At low magnetic fields the properties of single-component, or scalar condensates, are essentially unaffected but can become significantly altered for spinor Bose condensates as shown by our studies. We first study the Bose-Einstein condensation of trapped spin-1 Bose gases by employing the Hartree-Fock approximation and the two-fluid model within a mean field approximation. Our detailed investigation reveals that the ferromagnetically interacting spin-1 condensates exhibit triple condensations while the antiferromagnetically interacting ones show double condensations. The ground state structure of homogeneous and trapped spin-1 Bose condensates with ferromagnetic and antiferromagnetic interactions at zero temperature in magnetic fields are then investigated systematically. We further illuminate the important effect of quadratic Zeeman shift which causes a preferred occupation of the $|m_F=0 angle$ state through spin exchange collisions, $2|m_F=0 angle leftrightarrow |m_F=1 angle + |m_F=-1 angle$. We also present detailed studies of the off-equilibrium coherent dynamics of spin-1 Bose condensates in magnetic fields within the single spatial mode approximation. Dynamical instabilities of the off-equilibrium oscillations are shown to be responsible for the formation of multiple domains as recently observed in several $^{87}$Rb experiments. Finally, we discuss briefly excited condensate states, or soliton-like states, in cigar-shaped spin-1 Bose condensates with an effective quasi-1D description, using the developed nonpolynomial Schr"odinger equation. | en_US |
| dc.description.degree | Ph.D. | en_US |
| dc.format.extent | 1470944 bytes | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | http://hdl.handle.net/1853/7495 | |
| dc.language.iso | en_US | |
| dc.publisher | Georgia Institute of Technology | en_US |
| dc.subject | BEC | en_US |
| dc.subject | Spinor | |
| dc.subject | Zeeman effects | |
| dc.subject.lcsh | Zeeman effect | en_US |
| dc.subject.lcsh | Spinor analysis | en_US |
| dc.subject.lcsh | Magnetic fields | en_US |
| dc.subject.lcsh | Bose-Einstein gas | en_US |
| dc.title | Spin-1 atomic condensates in magnetic fields | en_US |
| dc.type | Text | |
| dc.type.genre | Dissertation | |
| dspace.entity.type | Publication | |
| local.contributor.corporatename | College of Sciences | |
| local.contributor.corporatename | School of Physics | |
| relation.isOrgUnitOfPublication | 85042be6-2d68-4e07-b384-e1f908fae48a | |
| relation.isOrgUnitOfPublication | 2ba39017-11f1-40f4-9bc5-66f17b8f1539 |
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