arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1702.00642cond-mat.quant-gas
收藏

利用弦关联函数揭示掺杂Hubbard链中隐藏的反铁磁关联

Revealing Hidden Antiferromagnetic Correlations in Doped Hubbard Chains via String Correlators

Timon A. Hilker, Guillaume Salomon, Fabian Grusdt, Ahmed Omran, Martin Boll, Eugene Demler, Immanuel Bloch, Christian Gross

摘要:

拓扑相,如自旋为1的链中著名的Haldom相,不服从局部序参量的表征。相反,可以采用非局部字符串序参量来揭示它们的隐藏顺序。在掺杂的一维晶格系统中,由于自旋-电荷分离现象,也出现了类似的稀磁关联。在这里,我们报告通过量子气体显微镜的空穴掺杂超冷费米-哈伯德链的直接观察这种隐藏的磁关联。非局域自旋密度关联函数的测量揭示了一个隐藏的有限程反铁磁序,自旋电荷分离的直接后果。我们的技术演示了如何在实验中直接测量拓扑顺序,它可以扩展到更高的维度,以研究磁序和密度波动之间的复杂相互作用。

英文摘要:

Topological phases, like the celebrated Haldane phase in spin-1 chains, defy characterization through local order parameters. Instead, non-local string order parameters can be employed to reveal their hidden order. Similar diluted magnetic correlations appear in doped one-dimensional lattice systems due to the phenomenon of spin-charge separation. Here we report on the direct observation of such hidden magnetic correlations via quantum gas microscopy of hole-doped ultracold Fermi-Hubbard chains. The measurement of non-local spin-density correlation functions reveals a hidden finite-range antiferromagnetic order, a direct consequence of spin-charge separation. Our technique demonstrates how topological order can directly be measured in experiments and it can be extended to higher dimensions to study the complex interplay between magnetic order and density fluctuations.

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。

↑