对称的康多格子国家在杂的紧张扭曲双层石墨烯中
Haoyu Hu1, Gautam Rai2, Lorenzo Crippa3
1Donostia International Physics Center, P. Manuel de Lardizabal 4, 20018 Donostia-San Sebastian, Spain.
Physical review letters
|November 5, 2023
概括
我们使用拓重和Kondo网格模型研究了扭曲双层石墨烯中的对称Kondo状态. 发现一个对称的Kondo状态,但在整数填充处被抑制,这表明通过兴奋剂或应变稳定.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
背景情况:
- 扭曲的双层石墨烯表现出由强烈的相关性影响的复杂电子特性.
- 了解局部时刻和导电电子之间的相互作用对于新的量子相来说至关重要.
研究的目的:
- 探索扭曲双层石墨烯中对称Kondo状态的存在和稳定性.
- 调查兴奋剂和压力对Kondo查和对称性破坏阶段的影响.
主要方法:
- 利用拓重费米子 (THF) 模型及其Kondo格子 (KL) 公式.
- 采用大N近似和平均场理论进行初始分析.
- 应用动态平均场理论 (DMFT) 来捕捉多体效应.
- 研究了C3z旋转对称性破坏应变的影响.
主要成果:
- 在KL模型中,在整数填充 (ν=0,±1,±2) 时确定了一个对称的Kondo状态.
- 研究人员发现,有序的,破坏对称性的状态在整数填充时具有较低的能量.
- 从整数填充物中去除兴奋剂减少了能量差异,有利于Kondo选.
- DMFT在整数填充时显示了较低的Kondo温度,但在非整数填充时更有效的选.
- 在足够的应变下,对称相可以在整数填充处稳定.
结论:
- 在扭曲的双层石墨烯中的整数填充处,对称的Kondo相被抑制.
- 非整数填充和施加的应变可以稳定对称的Kondo阶段.
- 这些发现为在更多材料中设计新的量子状态提供了途径.
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