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arXiv 0810.2958cond-mat.str-elcond-mat.dis-nn
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无序关联格点费米子系统中安德森局域化与反铁磁性的竞争

Competition between Anderson localization and antiferromagnetism in correlated lattice fermion systems with disorder

Krzysztof Byczuk, Walter Hofstetter, Dieter Vollhardt

摘要:

本文用动力学平均场论计算了半充满时无序哈伯德模型的磁基态相图,并结合自旋分辨的典型局域态密度.在弱相互作用下,多体关联和无序之间的竞争可以稳定顺磁和反铁磁金属相。强无序导致电子的安德森局域化,抑制反铁磁长程序。斯莱特和海森堡反铁磁体对无序的反应特征不同。这些结果可以用装入光晶格中的冷费米子原子来检验。

英文摘要:

The magnetic ground state phase diagram of the disordered Hubbard model at half-filling is computed in dynamical mean-field theory supplemented with the spin resolved, typical local density of states. The competition between many-body correlations and disorder is found to stabilize paramagnetic and antiferromagnetic metallic phases at weak interactions. Strong disorder leads to Anderson localization of the electrons and suppresses the antiferromagnetic long-range order. Slater and Heisenberg antiferromagnets respond characteristically different to disorder. The results can be tested with cold fermionic atoms loaded into optical lattices.

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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