Institut für Theoretische Physik, Albert-Einstein Allee 11, Universität Ulm, Germany.
Phys Rev Lett. 2011 May 27;106(21):215302. doi: 10.1103/PhysRevLett.106.215302. Epub 2011 May 26.
We present a quantitative finite temperature analysis of a recent experiment with Bose-Fermi mixtures in optical lattices, in which the dependence of the coherence of bosons on the interspecies interaction was analyzed. Our theory reproduces the characteristics of this dependence and suggests that intrinsic temperature effects play an important role in these systems. Namely, under the assumption that the ramping up of the optical lattice is an isentropic process, adiabatic temperature changes of the mixture occur that depend on the interaction between bosons and fermions. Matching the entropy of two regimes-no lattice on the one hand and deep lattices on the other-allows us to compute the temperature in the lattice and the visibility of the quasimomentum distribution of the bosonic atoms, which we compare to the experiment.
我们对最近在光学晶格中进行的玻色-费米混合物实验进行了定量的有限温度分析，其中分析了玻色子相干性对种间相互作用的依赖关系。我们的理论再现了这种依赖性的特征，并表明内在温度效应对这些系统很重要。具体来说，假设光学晶格的升压过程是等熵过程，则会发生混合体的绝热温度变化，其取决于玻色子和费米子之间的相互作用。匹配两个区域的熵-一方面是没有晶格，另一方面是深晶格-使我们能够计算晶格中的温度和玻色原子准动量分布的可见度，我们将其与实验进行了比较。
