Harnessing orbital and valley thermal transport in 2D materials: the significance of inversion symmetry.

IF 2.3 4区 物理与天体物理 Q3 PHYSICS, CONDENSED MATTER
Shivam Sharma, Abir De Sarkar
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引用次数: 0

Abstract

Orbitronics and valleytronics, analogous to spintronics, leverage the orbital degree of freedom and the valley degree of freedom of electrons to carry information, promising significant advancements in information processing. In this study, we disentangle the orbital and valley Nernst effect (VNE) in 2D monolayers, based on the global symmetry of the monolayers. We conduct an in-depth analysis of the orbital (valley) Nernst effect in inversion symmetric (asymmetric) monolayers, using an analytical tight binding model. Furthermore, we elucidate the dependence of the two effects on various inherent materials' parameters using the prototypical Kane-Mele model. Our calculations show that an inversion symmetric gapped Kagome lattice shows a significant orbital Nernst effect emerging from the interatomic contribution, even in the absence of both spin and VNEs. Furthermore, for the inversion asymmetric 2H-phase of TMDs, we elucidate that the valley degree of freedom encompasses the orbital degree of freedom and the VNE can be more accurately described using the orbital degree of freedom, hence termed as the valley-orbital Nernst effect.

利用二维材料中的轨道和谷热输运:反演对称性的意义。
轨道电子学和谷电子学类似于自旋电子学,利用电子的轨道自由度和谷自由度来携带信息,有望在信息处理方面取得重大进展。在这项研究中,我们基于单层的全局对称性,解开了二维单层中的轨道和谷能司特效应。我们使用解析紧密结合模型对反演对称(非对称)单层中的轨道(谷)能思特效应进行了深入的分析。此外,我们还利用Kane-Mele模型解释了这两种效应对各种固有材料参数的依赖关系。我们的计算表明,反转 ;对称间隙Kagome晶格显示出明显的轨道能思效应 ;从原子间的贡献中出现,即使在没有自旋 ;和谷能思效应的情况下。此外,对于tmd的反演不对称2h相,我们阐明了谷自由度包含了轨道自由度,而谷能斯特效应可以用轨道自由度更准确地描述,因此称为谷-轨道能斯特效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Physics: Condensed Matter
Journal of Physics: Condensed Matter 物理-物理:凝聚态物理
CiteScore
5.30
自引率
7.40%
发文量
1288
审稿时长
2.1 months
期刊介绍: Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.
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