在扭曲双层WSe2中的范霍夫奇点上的线性电阻
LingNan Wei1, Qiaoling Xu2,3, Yangchen He4
1National Laboratory of Solid-State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China.
概括
在扭曲的双层 WSe2 中的线性电阻在范霍夫奇点 (VHS) 中仍然存在,即使没有 Mott 过渡. 这种非费米液体行为表明在通用VHS中增强了散射,为moiré材料物理提供了洞察力.
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
- 量子材料是一种量子材料.
背景情况:
- 在范霍夫奇点 (VHSs) 的电阻力 (ρ T) 线性温度依赖的起源以及在杂的莫特绝缘体中的金属绝缘体过渡是激烈的理论辩论的主题.
- 存在相互竞争的理论模型,强调了实验验证的必要性.
研究的目的:
- 实验性研究线性-在-T电阻背后的机制在扭曲双层 (TB) WSe2.2.
- 探索移位场,填充和磁场对这种现象的影响.
- 要确定线性电阻是否与Mott过渡有关,或者是否发生在通用VHS中.
主要方法:
- 利用了扭曲双层 WSe2.2 的调节性特性.
- 系统地改变了位移场,电子填充和磁场.
- 追踪电阻测量作为温度和这些参数的函数.
主要成果:
- 在VHS中观察到持久的T线性电阻,即使远离半填充并且没有Mott绝缘过渡.
- 发现T-线性行为过渡到费米液体 (T^2) 行为在VHSs的兴奋剂.
- 证明移位场不会显著改变VHS的T线性电阻,而磁场会分裂VHS并揭示单独的T线性区域.
结论:
- 这些发现表明,在通用VHS中增强的散射,而不是仅在高阶VHS或Mott过渡期间通过量子临界点,驱动了观察到的非费米流体行为.
- 这项工作提供了关于moiré材料中VHS相关的多体物理和非费米液体特征的关键见解.
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