Observation of the Leggett-rice effect in a unitary fermi gas
We observe that the diffusive spin current in a strongly interacting degenerate Fermi gas of $^{40
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
2015
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| In: |
Arxiv
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| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1410.8517
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| Verfasserangaben: | S. Trotzky, S. Beattie, C. Luciuk, S. Smale, A.B. Bardon, T. Enss, E. Taylor, S. Zhang, and J.H. Thywissen |
MARC
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| 245 | 1 | 0 | |a Observation of the Leggett-rice effect in a unitary fermi gas |c S. Trotzky, S. Beattie, C. Luciuk, S. Smale, A.B. Bardon, T. Enss, E. Taylor, S. Zhang, and J.H. Thywissen |
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| 520 | |a We observe that the diffusive spin current in a strongly interacting degenerate Fermi gas of $^{40 |k precesses about the local magnetization. As predicted by Leggett and Rice, precession is observed both in the Ramsey phase of a spin-echo sequence, and in the nonlinearity of the magnetization decay. At unitarity, we measure a Leggett-Rice parameter $\gamma = 1.08(9)$ and a bare transverse spin diffusivity $D_0^\perp = 2.3(4)\,\hbar/m$ for a normal-state gas initialized with full polarization and at one fifth of the Fermi temperature, where $m$ is the atomic mass. One might expect $\gamma = 0$ at unitarity, where two-body scattering is purely dissipative. We observe $\gamma \rightarrow 0$ as temperature is increased towards the Fermi temperature, consistent with calculations that show the degenerate Fermi sea restores a non-zero $\gamma$. Tuning the scattering length $a$, we find that a sign change in $\gamma$ occurs in the range |0 < (k_F a)^{-1} \lesssim 1.3$, where $k_F$ is the Fermi momentum. We discuss how $\gamma$ reveals the effective interaction strength of the gas, such that the sign change in $\gamma$ indicates a switching of branch, between a repulsive and an attractive Fermi gas. | ||
| 650 | 4 | |a Physics - Atomic Physics | |
| 650 | 4 | |a Condensed Matter - Quantum Gases | |
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