کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8201745 | 1529841 | 2016 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low temperatures shear viscosity of a two-component dipolar Fermi gas with unequal population
ترجمه فارسی عنوان
دمایی برشی پایین ویسکوزیته گاز فرمی دوقطبی دو جزء با جمعیت نابرابر است
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کلمات کلیدی
گاز فرمی دو قطبی، توابع سبز اسپین پلاریزه، ویسکوزیته برشی،
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک و نجوم (عمومی)
چکیده انگلیسی
By using the Green's functions method and linear response theory we calculate the shear viscosity of a two-component dipolar Fermi gas with population imbalance (spin polarized) in the low temperatures limit. In the strong-coupling Bose-Einstein condensation (BEC) region where a Feshbach resonance gives rise to tightly bound dimer molecules, a spin-polarized Fermi superfluid reduces to a simple Bose-Fermi mixture of Bose-condensed dimers and the leftover unpaired fermions (atoms). The interactions between dimer-atom, dimer-dimer, and atom-atom take into account to the viscous relaxation time (Ïη). By evaluating the self-energies in the ladder approximation we determine the relaxation times due to dimer-atom (ÏDA), dimer-dimer (ÏcDD,ÏdDD), and atom-atom (ÏAA) interactions. We will show that relaxation rates due to these interactions ÏDAâ1,ÏcDDâ1, ÏdDDâ1, and ÏAAâ1 have T2, T4, eâE/kBT (E is the spectrum of the dimer atoms), and T3/2 behavior respectively in the low temperature limit (Tâ0) and consequently, the atom-atom interaction plays the dominant role in the shear viscosity in this rang of temperatures. For small polarization (ÏDA,ÏAAâ«ÏcDD,ÏdDD), the low temperatures shear viscosity is determined by contact interaction between dimers and the shear viscosity varies as Tâ5 which has the same behavior as the viscosity of other superfluid systems such as superfluid neutron stars, and liquid helium.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Annals of Physics - Volume 370, July 2016, Pages 105-116
Journal: Annals of Physics - Volume 370, July 2016, Pages 105-116
نویسندگان
E. Darsheshdar, H. Yavari, Z. Zangeneh,