arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2501.04201cond-mat.mes-hall
收藏

多层外尔半金属薄膜中表面工程诱导的非互易弹道输运

Nonreciprocal ballistic transport in multi-layer Weyl semimetal films with surface engineering

M. H. Zou, R. Ma, S. J. Xu, W. Chen, H. Geng, L. Sheng, D. Y. Xing

AI总结:

本文理论研究了表面修饰的外尔半金属薄膜中的非互易弹道输运,发现非互易性具有子带分辨特性,表面态主导贡献,且存在量子尺寸效应,态密度与厚度无关。

摘要:

外尔半金属(WSM)薄膜相较于其块体对应物展现出独特的电子性质。在本研究中,我们从理论上探讨了由表面修饰引起的外尔半金属薄膜中的非互易弹道输运现象。我们的分析表明,非互易性具有子带分辨特性,其中表面态对非互易性起主导贡献,而体态则引入负的修正。计算进一步揭示了一种量子尺寸效应:总体而言,非互易信号随薄膜厚度增加而减小,但当费米能量接近子带底部时,该信号会发生不连续性变化。此外,我们观察到这类多层系统中的态密度(DOS)呈现出与厚度无关的模式,这可以通过单变量理论得到有效解释。

英文摘要:

Weyl semimetal (WSM) thin films exhibit distinct electronic properties compared to their bulk counterparts. In this study, we theoretically investigate the nonreciprocal ballistic transport phenomena arising in WSM thin films due to surface modifications. Our analysis demonstrates that the nonreciprocity is sub-band-resolved, where the surface states provide the dominant contribution to the nonreciprocity, whereas the bulk states introduce a negative correction. Calculations further reveal a quantum size effect: overall, the nonreciprocal signal decreases with increasing film thickness, but it undergoes discontinuities as the Fermi energy approaches the bottom of a sub-band. Moreover, we observe that the density of states (DOS) in such multi-layer systems exhibits a thickness-independent pattern, which can be effectively explained by a single-variable theory.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑