Localization of correlated fermions in optical lattices with speckle disorder
Localization of correlated fermions in optical lattices with speckle disorder
复制标题
具有散斑紊乱的光学晶格中相关费米子的局域化
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
W. Hofstetter
中科院分区：
文献类型：
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作者：
D. Semmler;J. Wernsdorfer;U. Bissbort;K. Byczuk;W. Hofstetter
研究了三维和二维光学晶格中具有实际散斑无序的强相关费米子。我们扩展和应用统计动力平均场理论，它是非摄动地处理局部相关，在同等基础上纳入现场随机性和跳跃型随机性。通过局域态密度的概率分布函数检测无序引起的局域化。我们获得了一个完整的顺磁基态相图，并发现由于无序而引起的相关诱导金属绝缘子跃迁有很强的抑制作用。结果表明，由于散斑无序的特性，Anderson-Mott绝缘子和Mott绝缘子不是连续连接的。进一步讨论了有限温度对单粒子谱函数的影响。
Strongly correlated fermions in three- and two-dimensional optical lattices with experimentally realistic speckle disorder are investigated. We extend and apply the statistical dynamical mean-field theory, which treats local correlations non-perturbatively, to incorporate on-site and hopping-type randomness on equal footing. Localization due to disorder is detected via the probability distribution function of the local density of states. We obtain a complete paramagnetic ground state phase diagram for experimentally realistic parameters and find a strong suppression of the correlation-induced metal insulator transition due to disorder. Our results indicate that the Anderson-Mott and the Mott insulator are not continuously connected due to the specific character of speckle disorder. Furthermore, we discuss the effect of finite temperature on the single-particle spectral function.