LENS-European Laboratory for Non-Linear Spectroscopy and Dipartimento di Fisica, Università di Firenze, via N. Carrara 1, I-50019 Sesto Fiorentino-Firenze, Italy.
Phys Rev Lett. 2009 Oct 2;103(14):140401. doi: 10.1103/PhysRevLett.103.140401. Epub 2009 Sep 28.
We investigate experimentally the entropy transfer between two distinguishable atomic quantum gases at ultralow temperatures. Exploiting a species-selective trapping potential, we are able to control the entropy of one target gas in presence of a second auxiliary gas. With this method, we drive the target gas into the degenerate regime in conditions of controlled temperature by transferring entropy to the auxiliary gas. We envision that our method could be useful both to achieve the low entropies required to realize new quantum phases and to measure the temperature of atoms in deep optical lattices. We verified the thermalization of the two species in a 1D lattice.
我们实验研究了超低温度下两个可区分原子量子气体之间的熵转移。利用一种选择性的物质捕获势，我们能够在第二种辅助气体存在的情况下控制一个目标气体的熵。通过这种方法，我们将熵传递到辅助气体中，从而在受控温度的条件下使目标气体达到简并状态。我们设想，我们的方法不仅可以用来实现实现新的量子相所需的低熵，还可以用来测量深光学晶格中原子的温度。我们在一维晶格中验证了两种物质的热化。
