从基塔耶夫候选材料中的声子产生平面热霍尔效应
Lu Chen1, Étienne Lefrançois2, Ashvini Vallipuram2
1Institut quantique, Département de physique & RQMP, Université de Sherbrooke, Sherbrooke, QC, Canada. lu.chen@usherbrooke.ca.
Nature communications
|April 25, 2024
概括
声子,不仅仅是异国情调的粒子,可以引起平面热霍尔效应在Kitaev材料,如Na2Co2TeO6.6. 这一发现挑战了相关材料中以前的解释.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 量子材料是一种量子材料.
- 旋转液体的旋转液体
背景情况:
- 热霍尔效应是量子自旋液体中异国情调的关键探测器.
- 在像Alpha-RuCl3这样的Kitaev材料中,霍尔热导电性与Majorana费米子,奇拉磁子或声子有关.
- 一个平面热霍尔效应 (磁场与热流平行) 理论上预计对于费米子和磁子,但不是声子.
研究的目的:
- 为了调查平面热霍尔效应在基塔耶夫候选材料Na$_{2}$Co$_{2}$TeO$_{6}$中的起源.
- 为了确定声子是否可以导致或导致平面热霍尔效应.
- 根据新的证据,重新评估以往的研究结果.
主要方法:
- 在不同的磁场和热电流配置下,以Na$_{2}$Co$_{2}$TeO$_{6}$实验测量霍尔热导电.
- 测量后的霍尔导热率与材料的声音主导导热率的比较.
- 对平面热霍尔效应的方向依赖性的分析.
主要成果:
- 在Na$_{2}$Co$_{2}$TeO$_{6}$中观察到一个平面热霍尔效应.
- 观察到的效应与声主导的热导率非常相匹配,强烈暗示了声起源.
- 发现平面热霍尔效应的显著差异取决于热流和磁场的相对方向.
结论:
- 波可以产生平面热霍尔效应,这与之前的理论假设相反.
- 这些发现需要重新检查在$\alpha$-RuCl$_{3}$中观察到的平面热霍尔效应.
- 热流的方向是确定这些材料平面热霍尔效应的关键因素.
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