在URu中将Fano格子成像到"隐藏顺序"过渡
A R Schmidt1, M H Hamidian, P Wahl
1Laboratory for Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, New York 14853, USA.
Nature
|June 4, 2010
概括
在URu(2)Si(2) 中的隐藏顺序来自于Fano格子,而不是传统的密度波. 在17.5K以下,由于轻的k空间带分裂成重的费米离子带,形成了部分能量间隙.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料是一种量子材料.
- 强相关的电子系统 强相关的电子系统
背景情况:
- 由于局部和非局部电子之间强烈的杂交,Kondo网格表现出重子.
- 在55K以上,URu(2)Si(2) 显示重费米离子的行为,在T(o) = 17.5K时发生过渡.
- 转变的性质 (k空间排序与r空间杂交变化) 仍然未确定.
研究的目的:
- 为了同时在实空间 (r空间) 和动量空间 (k空间) 中成像URu(2) Si(2) 的电子结构.
- 为了阐明在T(o) = 17.5 K.时未识别的电子相位过渡的起源.
- 在URu(2) Si(2) 中描述"隐藏顺序"状态.
主要方法:
- 光谱成像扫描道显微镜 (SI-STM).
- 同时的r空间和k空间电子结构成像.
- 重型准粒子干扰成像.
主要成果:
- 在T ((o) 以上,观察到与Kondo选相一致的Fano格子电子结构.
- 在T(o) 下,一个部分能量差距形成,没有密度波特征.
- 差距源于一个轻的k空间带分裂成两个重的费米离子带.
结论:
- 在URu(2) Si(2) 中的"隐藏顺序"直接来自Fano格子电子结构.
- 过渡涉及U原子杂交和重费米离子状态的变化,而不是传统的密度波序.
- SI-STM提供了前所未有的同时r空间和k空间洞察力,以强烈相关的电子系统.
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