| Autor: |
Guzman, J., Jo, G. -B., Wenz, A. N., Murch, K. W., Thomas, C. K., Stamper-Kurn, D. M. |
| Rok vydání: |
2011 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. A 84, 063625 (2011) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevA.84.063625 |
| Popis: |
We investigate the long-term dynamics of spin textures prepared by cooling unmagnetized spinor gases of F=1 $^{87}$Rb to quantum degeneracy, observing domain coarsening and a strong dependence of the equilibration dynamics on the quadratic Zeeman shift $q$. For small values of $|q|$, the textures arrive at a configuration independent of the initial spin-state composition, characterized by large length-scale spin domains, and the establishment of easy-axis (negative $q$) or easy-plane (positive $q$) magnetic anisotropy. For larger $|q|$, equilibration is delayed as the spin-state composition of the degenerate spinor gas remains close to its initial value. These observations support the mean-field equilibrium phase diagram predicted for a ferromagnetic spinor Bose-Einstein condensate, but also illustrate that equilibration is achieved under a narrow range of experimental settings, making the F=1 $^{87}$Rb gas more suitable for studies of nonequilibrium quantum dynamics. |
| Databáze: |
arXiv |
| Externí odkaz: |
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