تقرير
Collective modes of a two-dimensional spin-1/2 Fermi gas in a harmonic trap
| العنوان: | Collective modes of a two-dimensional spin-1/2 Fermi gas in a harmonic trap |
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| المؤلفون: | Baur, Stefan K., Vogt, Enrico, Köhl, Michael, Bruun, Georg M. |
| المصدر: | Phys. Rev. A 87, 043612 (2013) |
| سنة النشر: | 2013 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Quantum Gases, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We derive analytical expressions for the frequency and damping of the lowest collective modes of a two-dimensional Fermi gas using kinetic theory. For strong coupling, we furthermore show that pairing correlations overcompensate the effects of Pauli blocking on the collision rate for a large range of temperatures, resulting in a rate which is larger than that of a classical gas. Our results agree well with experimental data, and they recover the observed cross-over from collisionless to hydrodynamic behaviour with increasing coupling for the quadruple mode. Finally, we show that a trap anisotropy within the experimental bounds results in a damping of the breathing mode which is comparable to what is observed, even for a scale invariant system. Comment: 8 pages, 3 figures (published version) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevA.87.043612 |
| URL الوصول: | http://arxiv.org/abs/1301.0358 |
| رقم الأكسشن: | edsarx.1301.0358 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevA.87.043612 |
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