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arXiv 1409.8348cond-mat.quant-gas
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超冷原子的费米莫特绝缘体的可压缩性

Compressibility of a fermionic Mott insulator of ultracold atoms

Pedro M. Duarte, Russell A. Hart, Tsung-Lin Yang, Xinxing Liu, Thereza Paiva, Ehsan Khatami, Richard T. Scalettar, Nandini Trivedi, Randall G. Hulet

摘要:

本文研究了三维光晶格中超冷原子排斥相互作用费米气体的Mott绝缘区。我们使用原位成像来提取气体的中心密度,并确定其局部可压缩性。对于中等到强相互作用,我们观察到出现的高原的密度作为原子数的函数,并减少在一个原子的密度每个网站的压缩性,表明形成的莫特绝缘体。比较国家的最先进的数值模拟的哈伯德模型在广泛的相互作用表明,气体的温度的顺序,或低于,隧道能量尺度。我们的结果对于探索具有超冷原子的多体现象具有很大的希望,其中局部可压缩性可以成为检测特定填充值下不同相或相边界特征的有用工具。

英文摘要:

We characterize the Mott insulating regime of a repulsively interacting Fermi gas of ultracold atoms in a three-dimensional optical lattice. We use in-situ imaging to extract the central density of the gas, and to determine its local compressibility. For intermediate to strong interactions, we observe the emergence of a plateau in the density as a function of atom number, and a reduction of the compressibility at a density of one atom per site, indicating the formation of a Mott insulator. Comparisons to state-of-the-art numerical simulations of the Hubbard model over a wide range of interactions reveal that the temperature of the gas is of the order of, or below, the tunneling energy scale. Our results hold great promise for the exploration of many-body phenomena with ultracold atoms, where the local compressibility can be a useful tool to detect signatures of different phases or phase boundaries at specific values of the filling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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