An ideal Josephson junction in an ultracold two-dimensional Fermi gas

doi:10.1126/science.aaz2342

GSTDTAP > 气候变化

DOI	10.1126/science.aaz2342
	An ideal Josephson junction in an ultracold two-dimensional Fermi gas
	Niclas Luick; Lennart Sobirey; Markus Bohlen; Vijay Pal Singh; Ludwig Mathey; Thomas Lompe; Henning Moritz
	2020-07-03
发表期刊	Science
出版年	2020
英文摘要	In superconductors, electrons form a macroscopic wave function that has a definite phase. If two superconductors with different wave function phases are placed in contact with each other through an insulating link, a current will flow through this so-called Josephson's junction without any external voltage. Luick et al. and Kwon et al. observed an analogous phenomenon in a setup that involved two reservoirs of superfluid Fermi gases. Both groups measured the so-called current-phase relation: the dependence of the magnitude of the current on the relative phase. By tuning an external magnetic field, they were able to study how the interactions between fermions affected the nature of the superfluid state. Science , this issue p. [89][1], p. [84][2] The role of reduced dimensionality in high-temperature superconductors is still under debate. Recently, ultracold atoms have emerged as an ideal model system to study such strongly correlated two-dimensional (2D) systems. Here, we report on the realization of a Josephson junction in an ultracold 2D Fermi gas. We measure the frequency of Josephson oscillations as a function of the phase difference across the junction and find excellent agreement with the sinusoidal current phase relation of an ideal Josephson junction. Furthermore, we determine the critical current of our junction in the crossover from tightly bound molecules to weakly bound Cooper pairs. Our measurements clearly demonstrate phase coherence and provide strong evidence for superfluidity in a strongly interacting 2D Fermi gas. [1]: /lookup/doi/10.1126/science.aaz2342 [2]: /lookup/doi/10.1126/science.aaz2463
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/281889
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Niclas Luick,Lennart Sobirey,Markus Bohlen,et al. An ideal Josephson junction in an ultracold two-dimensional Fermi gas[J]. Science,2020.
APA	Niclas Luick.,Lennart Sobirey.,Markus Bohlen.,Vijay Pal Singh.,Ludwig Mathey.,...&Henning Moritz.(2020).An ideal Josephson junction in an ultracold two-dimensional Fermi gas.Science.
MLA	Niclas Luick,et al."An ideal Josephson junction in an ultracold two-dimensional Fermi gas".Science (2020).