Cooling phonon modes of a Bose condensate with uniform few body losses
Cooling phonon modes of a Bose condensate with uniform few body losses
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具有均匀的少量体损失的玻色凝聚体的冷却声子模式
DOI：
10.21468/scipostphys.5.5.043
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发表时间：
2018
期刊：
影响因子：
5.5
通讯作者：
C. Henkel
中科院分区：
文献类型：
--
作者：
I. Bouchoule;M. Schemmer;C. Henkel
我们提出了一个一般性的分析冷却产生的损失，
冷凝物或准冷凝物。我们研究的职业是如何
集体声子模式随时间演化，假设损失过程
是足够慢的，使得每个模式自动地跟随
平均密度。该理论适用于任何损失率为
与jjth成比例
密度的幂，但在其他方面空间均匀。我们涵盖两者
均质气体和系统局限在一个光滑的潜力。用于
低维气体，我们可以考虑修改后的方程
由于云的宽度沿着紧密的
限制方向，这发生在大的相互作用中。我们发现
在很大程度上，温度与能量成比例地降低，
比例为mc^2mc2，
其中mm
是粒子的质量，cc
声速我们计算这两个的渐近比
不同极限情况下的量：任何情况下的均匀气体
一维和一维气体在一个谐波陷阱。
We present a general analysis of the cooling produced by losses on
condensates or quasi-condensates. We study how the occupations of the
collective phonon modes evolve in time, assuming that the loss process
is slow enough so that each mode adiabatically follows the decrease of
the mean density. The theory is valid for any loss process whose rate is
proportional to the jjth
power of the density, but otherwise spatially uniform. We cover both
homogeneous gases and systems confined in a smooth potential. For a
low-dimensional gas, we can take into account the modified equation of
state due to the broadening of the cloud width along the tightly
confined directions, which occurs for large interactions. We find that
at large times, the temperature decreases proportionally to the energy
scale mc^2mc2,
where mm
is the mass of the particles and cc
the sound velocity. We compute the asymptotic ratio of these two
quantities for different limiting cases: a homogeneous gas in any
dimension and a one-dimensional gas in a harmonic trap.
影响因子：
2.9
作者：
Cockburn, S. P.;Negretti, A.;Henkel, C.
通讯作者：
Henkel, C.