论文标题
观察强相关的二维费米气体中超流体的观察
Observation of superfluidity in a strongly correlated two-dimensional Fermi gas
论文作者
论文摘要
了解密切相关的二维（2D）系统如何引起非常规的超导性和较高的临界温度是凝聚态物理学的主要未解决问题之一。 Ultracold 2D Fermi气体已成为清洁可控制的模型系统，以研究强相关性和尺寸降低的相互作用，但缺少这些系统中超流体的直接证据。在这里，我们通过将周期性的电位通过系统移动并观察到关键速度v $ _ {\ rm c} $以下未耗散来证明超速2D费米气体中的超流体。我们测量v $ _ {\ rm c} $作为交互强度的函数，并在玻色症和费米子超流体之间的交叉态度中找到最大值。我们的测量结果建立了超低的费米气体，作为研究降低性降低对密切相关性超流体的影响的强大工具。
Understanding how strongly correlated two-dimensional (2D) systems can give rise to unconventional superconductivity with high critical temperatures is one of the major unsolved problems in condensed matter physics. Ultracold 2D Fermi gases have emerged as clean and controllable model systems to study the interplay of strong correlations and reduced dimensionality, but direct evidence of superfluidity in these systems has been missing. Here, we demonstrate superfluidity in an ultracold 2D Fermi gas by moving a periodic potential through the system and observing no dissipation below a critical velocity v$_{\rm c}$. We measure v$_{\rm c}$ as a function of interaction strength and find a maximum in the crossover regime between bosonic and fermionic superfluidity. Our measurement establishes ultracold Fermi gases as a powerful tool for studying the influence of reduced dimensionality on strongly correlated superfluids.
