在异型四端拓学节点线半金属中Nernst效应
Xue-Yan Cheng1, Ning-Xuan Yang1,2, Rui Wang1
1Department of Physics, College of Sciences, Shihezi University, Shihezi 832000, People's Republic of China.
概括
在拓节点线半金属中,Nernst效应显示了根据磁场和温度的振荡峰值. 旋转轨道合显著影响了这种热电传输,尤其是在存在能量差距的情况下.
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
- 量子运输是一种量子运输.
背景情况:
- 纳恩斯特效应描述了磁场下的横向热电传输.
- 拓节点线半金属 (TNLSMs) 具有独特的电子特性.
- 对于设备应用来说,了解介面镜系统中的热电现象至关重要.
研究的目的:
- 在一个半透镜TNLSM系统中研究Nernst效应.
- 分析旋转轨道合和磁场对热电传输的影响.
- 探索横向热电装置的潜在应用.
主要方法:
- 采用四端横杆几何学,用于中视镜TNLSMs.
- 采用了紧密结合的哈密尔顿模型.
- 运用非平衡格林的函数方法进行计算.
- 研究了两个连接模式:kz-y和kx-y.
主要成果:
- 在没有磁场的情况下,Nernst系数为零.
- 在Nernst系数中与磁场一起观察到密集振荡的峰值.
- 纳斯特系数表现出与费米能量 (Nc(-EF) = Nc(EF)) 相比的偶对称.
- 在低温下对温度的线性依赖 (T→0).
- 当费米能量在强磁场中穿过兰道水平时,会出现峰值.
- 旋转轨道合在弱磁场中显著影响纳恩斯特效应.
- 一个质量项打破了PT对称性,打开了一个能量差距,并导致一个大的Nernst系数.
结论:
- 在TNLSM中,Nernst效应对磁场,温度和费米能量非常敏感.
- 旋转轨道合在调节热电传输方面发挥着至关重要的作用.
- 在能源差距中观察到的大纳斯特系数表明了横向热电运输有前途的应用.
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