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arXiv 1005.4657cond-mat.mes-hallcond-mat.other
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来自准一维铟纳米线的非费米液体行为的可能证据

Possible evidence of non-Fermi liquid behavior from quasi-one-dimensional indium nanowires

Choongyu Hwang, Namdong Kim, Sunyoung Shin, Jinwook Chung

摘要:

报道了在室温下从Si(111)-7 $\times$ 7表面自组装的准一维铟(In)纳米线中观察到的非费米液体(NFL)的可能证据。使用高分辨率的电子能量损失谱,我们已经测量了在纳米线中的低能量intrasubband等离子体激元激发的能量和宽度色散。我们观察到的能量动量色散$ω$(q)在低q极限完全由NFL理论和随机相位近似预测。然而,用指数$α$ =1.40 $\pm$ 0.24测量的不寻常的非分析宽度色散$ζ(q) \sim q^α$,仅由NFL理论理解。这种低能量激发的异常宽度分散可以探测非理想1D相互作用电子系统的NFL特征,尽管显著抑制了自旋-电荷分离($\leq$ 40 meV)。

英文摘要:

We report possible evidence of non-Fermi liquid (NFL) observed at room temperature from the quasi one-dimensional (1D) indium (In) nanowires self-assembled on Si(111)-7$\times$7 surface. Using high-resolution electron-energy-loss spectroscopy, we have measured energy and width dispersions of a low energy intrasubband plasmon excitation in the In nanowires. We observe the energy-momentum dispersion $ω$(q) in the low q limit exactly as predicted by both NFL theory and the random-phase-approximation. The unusual non-analytic width dispersion $ζ(q) \sim q^α$ measured with an exponent $α$=1.40$\pm$0.24, however, is understood only by the NFL theory. Such an abnormal width dispersion of low energy excitations may probe the NFL feature of a non-ideal 1D interacting electron system despite the significantly suppressed spin-charge separation ($\leq$40 meV).

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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