从韦尔到自链半金属的相位过渡使用双循环激光
1Centre for Nanotechnology, IIT Roorkee, Roorkee, Uttarakhand 247667, India.
概括
双循环极化光会在非赫密特的韦尔半金属中诱导新型带交换,从而产生独特的双环和自我链接的费米表面. 本研究探讨了这些拓变化和贝里曲率变化.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 拓学材料科学科学 拓学材料科学
背景情况:
- 非赫米斯维尔半金属 (NH WSMs) 具有独特的拓性质.
- 外界对NH WSM的影响是一个活跃的研究领域.
研究的目的:
- 为了研究双循环 (BCL) 极化光对三重非赫尔密斯维尔半金属的费米表面拓学的影响.
- 分析由此产生的频段交换现象及其对电子频段结构的影响.
主要方法:
- 在BCL光下对非隐居系统的理论建模.
- 费米表面拓和带结构的分析.
- 计算贝里曲率变化.
主要成果:
- BCL光修改了三重NH WSMs的对称性,诱导了不寻常的频段交换.
- 观察到虚构带之间的交换,有或没有特殊的退化.
- 形成独特的费米表面,包括双环和自我连接结构.
结论:
- 在NH WSM中,BCL偏光驱动显著的拓过渡.
- 观察到的带交换导致了新的费米表面几何.
- 这些发现为量子材料中拓状态的控制提供了新的见解.
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