由电子对电子相关性驱动的过渡到哈尔丹阶段.
A Jażdżewska1, M Mierzejewski2, M Środa2
1Faculty of Physics and Astronomy, University of Wrocław, 50-383, Wrocław, Poland.
Nature communications
|December 21, 2023
概括
两个轨道哈巴德模型中的相互作用电子可以表现出拓性质,显示出哈尔丹边缘状态的出现,随着电子-电子相互作用强度的增加.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子多体系统是一个量子多体系统.
背景情况:
- 旋转-1反铁磁海森堡链以其拓性质和奇特的边缘状态而闻名.
- 对具有不同电子-电子相互作用强度的强相关系系统的分析对于理解新出现的现象至关重要.
研究的目的:
- 为了研究在两个轨道的哈巴德模型中拓的哈尔丹边缘状态的出现.
- 探索增加电子-电子相互作用强度 (Hubbard U和Hund J) 在拓性质上的作用.
主要方法:
- 利用两个轨道的哈伯德模型来模拟相互作用的电子.
- 系统地改变了Hubbard排斥 (U) 和Hund相互作用 (JH) 的强度.
- 分析了基态属性,以确定拓过渡.
主要成果:
- 发现相互作用形成了磁时刻和一个拓学上非碎的费米子多体基本状态.
- 观察到Haldane阶段特征的零能量边缘状态.
- 在拓上微不足道和非微不足道的基本状态之间发现了一个尖的过渡点,随着相互作用强度的增加.
结论:
- 哈尔丹边缘可以在强烈相关的电子系统中出现,例如两轨道哈巴德模型.
- 在显著的磁矩发展之前,即使在相对较小的相互作用强度下,拓性的非平凡性也会出现.
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