Nonlinear adiabatic passage from fermion atoms to boson molecules

被引：33
作者：
Pazy, E
Tikhonenkov, I
Band, YB
Fleischhauer, M
Vardi, A
机构：
[1] Ben Gurion Univ Negev, Dept Chem, IL-84105 Beer Sheva, Israel
[2] Tech Univ Kaiserslautern, Fachbereich Phys, D-67663 Kaiserslautern, Germany
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 17期
关键词：
D O I：
10.1103/PhysRevLett.95.170403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the dynamics of an adiabatic sweep through a Feshbach resonance in a quantum gas of fermionic atoms. Analysis of the dynamical equations, supported by mean-field and many-body numerical results, shows that the dependence of the remaining atomic fraction Gamma on the sweep rate alpha varies from exponential Landau-Zener behavior for a single pair of particles to a power-law dependence for large particle number N. The power law is linear, Gamma proportional to alpha, when the initial molecular fraction is smaller than the 1/N quantum fluctuations, and Gamma proportional to alpha(1/3) when it is larger. Experimental data agree well with a linear dependence, but do not conclusively rule out the Landau-Zener model.
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页数：4
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