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arXiv 0808.0913cond-mat.str-elcond-mat.dis-nn
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d=2 Mott跃迁的电子Griffiths相

Electronic Griffiths phase of the d=2 Mott transition

E. C. Andrade, E. Miranda, V. Dobrosavljevic

摘要:

我们调查的影响T=0 Brinkman-Rice(BR)的莫特金属-绝缘体转变(MIT)的情况下,在二维(2D)的无序。对于足够弱的无序过渡保留莫特字符,作为信号的消失的本地准粒子(QP)的权重Z_{i}和强无序筛选临界。与高维情况相比,在临界区域,QP参数的局部空间涨落被强烈增强,分布函数为P(Z)~ Z^{α-1},α在跃迁处趋于零.这种行为表明,在MIT之前,电子格里菲斯阶段的出现是一个强大的出现,令人惊讶地让人想起无序量子磁体的“无限随机不动点”场景。

英文摘要:

We investigate the effects of disorder within the T=0 Brinkman-Rice (BR) scenario for the Mott metal-insulator transition (MIT) in two dimensions (2d). For sufficiently weak disorder the transition retains the Mott character, as signaled by the vanishing of the local quasiparticles (QP) weights Z_{i} and strong disorder screening at criticality. In contrast to the behavior in high dimensions, here the local spatial fluctuations of QP parameters are strongly enhanced in the critical regime, with a distribution function P(Z) ~ Z^{α-1} and αtends to zero at the transition. This behavior indicates a robust emergence of an electronic Griffiths phase preceding the MIT, in a fashion surprisingly reminiscent of the "Infinite Randomness Fixed Point" scenario for disordered quantum magnets.

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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